JP3306349B2 - Rice cooking method and microwave rice cooker used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave rice cooker for heating rice, water and the like by irradiating microwaves, and in particular, a novel rice cooking method which enables delicious cooking in a short time and its method. The present invention relates to a microwave rice cooker used in the method.

[0002]

2. Description of the Related Art As a heating method used in a conventional rice cooker, a heating method using a fuel gas, an electric heater, a halogen lamp heater, or an IH (Induction Heating:
Although a method using an induction heating method) is known, a microwave oven, that is, a method using a microwave irradiation heating method is attracting attention as a method different from these methods.

FIG. 5 shows an example of a conventional configuration for cooking rice using a general microwave oven. As shown in FIG.
Is formed, and a microwave is supplied into the oven 33 from a magnetron (not shown). When rice is cooked using this microwave oven, a rice cooker 35 with a lid 34 made of a microwave transmitting material is housed in an oven 33 to perform microwave heating.

[0004] Also, prior arts in which various improvements have been made to the above-mentioned conventional configuration are disclosed in, for example, Japanese Utility Model Publication No. 5-30665, Japanese Utility Model Application Laid-Open No. 2-116208, Japanese Patent Application Laid-Open No. 5-44943, and Japanese Patent Application Laid-Open No. 7-155253. No., JP-A-5-71
No. 739 and the like.

[0005] In the rice cooking method disclosed in the above-mentioned prior art examples, the following type of rice cooker is used as a rice cooker housed in an oven of a microwave oven. That is, as a container with a lid, a lid and a container are formed from a plastic molded product that transmits microwaves, or a metal having good thermal conductivity such as aluminum or an aluminum alloy, and the microwave is applied to the outer surface thereof. A container coated with a ferrite-based magnetic material or cermet that has the property of absorbing and generating heat, and a container made of ceramic such as glass or porcelain, and a metal oxide thin film such as tin oxide or indium oxide on the surface. There are those formed.

[0006] When rice is cooked by storing the above various rice cookers in an oven of a microwave oven, as described above, a prescribed amount of washed rice and water is put into the rice cooker and microwave irradiation is performed. In the case of a rice cooker made of a molded plastic product, microwaves transmitted through the plastic layer vibrate water in the container to heat the water, thereby raising the temperature of rice.

[0007] In the case of a rice cooker in which the surface of a container made of metal or ceramic is coated with a film that generates microwaves, the irradiated microwaves are temporarily absorbed by the microwave absorbing and heating element film to generate heat. Then, the heat is conducted to the container made of metal or ceramic to heat the water in the container, thereby raising and heating the rice.

In addition to the above prior art examples, Japanese Patent Application Laid-Open No.
In Japanese Patent No. 71739, a pressure regulating valve is provided in a cooking chamber having a closed structure, and by adjusting the opening of the pressure regulating valve, the internal pressure of the cooking chamber can be adjusted according to the type of cooking. A microwave cooking structure is disclosed.

[0009]

However, in the microwave heating method according to any of the above-mentioned prior art examples, the conventional heating method using a fuel gas, an electric heater, a halogen lamp heater or IH is different from the conventional heating method. It can be said that the principle is the same. That is, in the case of the conventional heating method using a heat source other than microwaves, a process of heating rice by heat conduction of water is used for heating water for cooking rice and rice. On the other hand, in the case of the microwave heating method, since rice is heated by directly or indirectly heating water by microwave irradiation, the heating process does not differ only with a difference in heating means.

[0010] For this reason, there is no change in the deliciousness after cooking and the cooking time regardless of the microwave heating method or the heating method using another heat source. The characteristics of the cooked rice cannot be found. On the contrary, the heating efficiency of microwave heating is about 50% or more, so the input energy is required about twice, and the type using 100V commercial power supply Then 5 go (0.9 liters)-1 sho (1.8 liters)
It has been difficult to realize a cooking type product.

The present invention has been made in view of the above-mentioned problems, and enables a high-speed rice cooker and a large amount of rice cooker at a time by a new rice cooker heating system different from the conventional system.
It is an object of the present invention to provide a rice cooking method capable of realizing a delicious and good cooked rice and a microwave rice cooker used in the method.

[0012]

In order to achieve the above object, a first microwave cooking method according to the present invention is to immerse washed rice grains for a predetermined time to absorb water, drain the absorbed water grains, and then microwave the rice grains. Preheat to a predetermined temperature by heating,
A pre-heated rice grain is characterized by adding a predetermined amount of water or hot water (particularly preferably hot water) to cook rice by heating control.

That is, rice is washed and irradiated with microwaves to a certain extent to absorb water to promote swelling by raising the temperature from the core due to self-heating, so that the rice is easily absorbed and cooked for a short time to cook rice. It becomes possible. Cooking rice with hot water can further reduce the time. In addition, rice cooked by microwave heating makes it possible to cook rice with less uneven cooking.

A microwave rice cooker according to the present invention for realizing the first method is a microwave rice cooker configured to irradiate microwaves into a rice cooker having a microwave leakage preventing structure, The rice cooking room is provided with a rice grain container and hot water supply means for supplying hot water to the rice grains.

In the above configuration, the hot water supply means may include:
A hot water container provided in the rice cooker, and a drive mechanism for displacing the hot water container and the rice grain container relatively to immerse the rice grains in the hot water in the hot water container, specifically, a hot water container provided in the rice cooker , A rice grain storage container can be rotated to drive the rice grains into the boiling water in the boiling water container with a driving mechanism. In this configuration, the microwave-heated rice grains and the boiling water respectively reach the set temperature independently. After that, it becomes possible to operate the drive mechanism to immerse the rice grains in boiling water and cook rice.

By the way, as a heat source as in the above configuration,
In the case where only the microwave is used, a sufficient heating rate may not be obtained in some cases. Therefore, in the second microwave rice cooking method of the present invention, after preheating in the same step as the first method, in the rice heating step, the rice grains and water are mixed to absorb the water in the rice grains. The convection of the water is caused by a heat source different from the wave irradiation to heat the rice grains.

A microwave rice cooker according to the present invention for realizing the second method has a configuration in which the boiling water container is disposed below the rice grain container, and a halogen heater or the like is provided below the boiling water container. A heat source different from the magnetron is provided. This makes it possible to use the heating source separately by dividing and using both the advantage of microwave heating and the advantage of the rising characteristics of another heat source.

However, in a configuration in which another heat source is shared, the heat resistance of the hot water container becomes a problem. Therefore, in this case, it is preferable to use a boiling water container in which a black ferrite coating excellent in microwave absorption is applied to the outer surface of a metal container having excellent heat resistance and good heat conductivity that does not transmit microwaves. To

Further, when the rice grain container is formed of a net-like molded body, it is possible to instantly mix the hot water with the washed rice in the rice grain container in order to facilitate the entry of hot water heated to a predetermined temperature. It becomes possible to smoothly perform the conversion of rice starch into α.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional structure of a microwave rice cooker according to the first embodiment, and FIGS. 1A and 1B show different operation states. Specifically, FIG.
(A) shows an operation mode when water and rice grains are separately charged, or when water and rice grains have each reached a predetermined temperature appropriately by microwaves. On the other hand, FIG. 1 (B) shows a state in which when the water and the rice grains reach the respective predetermined temperatures, the water in the boiling water container and the rice in the rice grain storage container are mixed, and the water and the rice are leveled evenly. ing.

In FIG. 1 (A), reference numeral 1 denotes a rice cooker main body, in which an enclosed rice cooker 3 for cooking rice is provided in an outer box 2 forming an exterior part. The opening on the upper surface facing the opening of the shuttle can be freely opened and closed by the door 4. Further, the metal outer pot 3 is configured to prevent radio wave leakage and allow water vapor to escape.

An inner pot 5 is provided inside the outer pot 3. Inner hook 5 and the vertically movable hot water container 6 is constituted by a grain of rice container 7 hot water container 6 is accommodated in the hot water container 6 in a state where the rise.

The hot water container 6 is a molded product made of plastics such as PP, PES, PPS or the like having a heat resistance of 120 ° C. or higher which transmits microwaves, or ceramics such as crystallized glass. The first height position shown in FIG. 1A (set so that the water level during the most cooked rice is slightly lower than the bottom surface of the rice grain container 7) by the cylinder type lifting device 8 and FIG. The second height position shown in FIG.
Is set to be slightly lower than the bottom surface of the rice grain container 7).

On the other hand, the rice grain container 7 accommodates washed rice grains, and is made of a heat-resistant plastic that transmits and regulates microwaves or a punching metal as a metal net-shaped molded body made of stainless steel, aluminum, or the like. It is formed, and a number of water intrusion holes 9 are provided on the bottom surface. The hot water container 6 and the rice grain container 7 of the inner pot 5 are
It is detachable from the rice cooker main body 1 so that it can be easily washed.

A magnetron 10 for irradiating microwaves is provided outside the outer kettle 3, and the microwave generated by the magnetron 10 passes through a waveguide 11 to an irradiation port provided in the outer kettle 3. Radiated from 12 toward the inner pot 5. Reference numeral 13 denotes a transformer provided outside the outer hook 3.

Although not shown, the rice cooker body 1 is not shown.
A control unit including a microcomputer for controlling the driving of the elevating device 8 and the magnetron 10 and controlling rice cooking such as temperature adjustment, and other necessary electric components are provided therein.

Next, a rice cooking process using the rice cooker having the above configuration will be described with reference to FIG.

First, after rice cooking is started, in step S1, a required amount of polished rice grains is weighed, put into a rice grain container 7 taken out of the rice cooker main body 1, and water is further added to grind rice several times. And wash the rice.

For a predetermined time in the immersion state, specifically, 20 minutes to
Leave for 100 minutes, typically about 1 hour, soak in rice required for cooking in step S2, absorb water, drain in step S3, and put washed rice grains R in rice grain container 7 in step S4. .

In step S5, as shown in FIG.
An amount suitable for the amount of the washed rice grains R, specifically, approximately the same amount of water for cooking rice W as the conventional water amount is put into the hot water container 6, the hot water container 6 is set on the elevating device 8, and The storage container 7 is set at a predetermined position above the hot water container 6, the door 4 is closed in step S6 to seal the inside of the outer pot 3, and the preparation of rice cooking is completed.

Next, when the power switch (not shown) is set to 0 N in step S 7 to operate the magnetron 10, microwaves are emitted from the irradiation port 12 to the inner pot 5 through the waveguide 11. In step S8, the microwave is simultaneously applied to the boiling water container 6 and the rice grain container 7, and penetrates both the containers 6, 7 to be incident on the water W and the rice grain R, thereby causing them to generate heat. At this time, it is necessary to adjust the microwave transmission amount of the rice grain container 7 so that the hot water temperature in the hot water container 6 is 95 to 100 ° C. and the rice grain temperature in the rice grain container 7 does not exceed 80 ° C.

Then, in step S9, the water W in the boiling water container 6 becomes boiling water, and the temperature is increased until the temperature of the rice grains R in the rice grain container 7 reaches a predetermined temperature (40 ° C. to 80 ° C., 60 ° C. as a standard). As shown in FIG. 1B, the hot water container 6 is moved upward by the operation of the lifting device 8 to mix the hot water container 6 and the rice grain storage container 7 in step S10, and the rice grains R absorb water at high speed. In addition, a post-cooking process is performed.

Next, in step S11, the magnetron 10
And the water W and the rice grains R in the inner pot 5 are heated to a temperature of 98 ° C. or more. further,
In step S12, microwave output control is performed to
By maintaining the heating state for 0 to 15 minutes, the β-starch of rice is changed to α-starch. And turn the power off
F, keep it in that state, steam for about 5 to 10 minutes, and finish cooking rice.

In the above process, step S8
In order to adjust the amount of microwave transmission of the rice grain container 7 so that the hot water temperature does not exceed 95 ° C. and the rice grain temperature does not exceed 80 ° C., the arrangement of the hot water container 6 and the rice grain container 7 and microwave irradiation are performed. Adjusting the position of the irradiation port 12 to be performed.

Further, the structure of the rice grain container 7 may be modified. That is, in order to adjust the microwave transmission amount in a direction in which the amount of microwave transmission is controlled, a sheet metal molded body having an appropriate size and shape is fitted into the rice grain container 7 or the hole diameter of the punching metal constituting the rice grain container 7 is adjusted. The amount of microwave transmission is adjusted by taking measures such as designing the diameter appropriately, and 40 ° C <T <80 ° C (where T:
By setting the rice grain temperature), simultaneous microwave irradiation to the boiling water container 6 and the rice grain storage container 7 can be realized.

In the meantime, in the case of the rice grain container 7 made of a metal perforated mesh container, unlike a plastics container made of PP or the like, there arises a problem such as separation of cooked rice.
Therefore, it is preferable to apply a non-adhesive film treatment such as a fluororesin coating to the inner surface of the net-shaped molded body to improve the separation of cooked rice and improve the cleaning property. In addition, in order to realize uniform heating when irradiating microwaves, it is preferable to apply a microwave absorbing heating element treatment such as a ferrite coating film on the outer surface.

Further, in the case of the metal perforated mesh container,
Rice grains having a pore size of 3 mm or more through which microwaves can penetrate fall off. Therefore, if a PP film having a small hole of 1.5 mm or less is laminated on the inner surface or the outer surface to prevent this, microwaves can be transmitted and rice grains can be prevented from falling.

On the other hand, if the rice grain container 7 is made of plastics and is a mesh-shaped container having a mesh through which microwaves can be transmitted and hot water heated to a predetermined temperature (95 ° C. or higher) can enter, a preheating is performed. Hot water and washed rice can be instantaneously mixed, the temperature of the next step of 98 ° C. or higher can be smoothly raised and the rice starch can be pre-gelatinized and cooked deliciously. Also in this case, if the mesh, that is, the hole diameter for water passage is about 1.5 mm or less, it is possible to prevent the rice grains from spilling out of the rice grain storage container 7.

In the rice cooking process according to the present embodiment, the rice grains R and the water W which have been washed are separately irradiated with microwaves, so that the conventional rice cooking of about 50 minutes can be cooked in 25 to 30 minutes. , Can be cooked quickly.

The output of the magnetron 10 is 100
V, when using 5 to 1 sq.m. cooked with 700 to 800 W, the temperature of rice grains R rises to 40 to 80 ° C. by microwave irradiation for about 2 to 5 minutes, At this time, the swelling is promoted by the temperature rise from the core of the rice grains R due to self-heating, and the rice grains R are in a state of easily absorbing water. As a result, it is considered that the cooked rice at the end of the cooked rice becomes a plump, chewy and delicious cooked rice.

In this embodiment, as the hot water supply means, the hot water container 6 is moved up and down by the elevating device 8 so that the rice grain container 7 is accommodated in the hot water container 6. A similar cooked rice can be obtained even if the storage container 7 is linked to the lifting device so as to be movable down into the hot water container 6. In addition, rice grain container 7
May be provided so that the rice grains in the rice grain container 7 are put into the hot water vessel 6.

FIGS. 3 and 4 show a microwave rice cooker according to a second embodiment of the present invention. FIG. 3 shows a sectional structure thereof, and FIG. 4 shows a rice cooking process. In the present embodiment, portions having the same configuration and operation as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the rice cooker according to the present embodiment has all the components of the rice cooker according to the first embodiment.
A heat source different from the magnetron 10 is provided below the hot water container 6 of the inner pot 5. Specifically, as another heat source, an electric resistance heating element such as a sheath heater, a mica heater, a halogen heater, an electromagnetic induction heating, and a gas burner of a heat ray radiated electromagnetic wave composed of visible light, infrared, and far infrared, High heat power other than rapid microwave heating. Here, a case using the halogen heater 14 as a heat source will be described.

The halogen heater 14 has an output of 1000 to 1
A ring formed at 200 W is used, and is installed on a reflector 15 horizontally arranged near the inner bottom surface of the outer hook 3. The reflection plate 15 is formed by brightly finishing a metal having excellent corrosion resistance and heat resistance such as stainless steel or aluminum.

A metallic microwave shielding ring 16 is joined to the boiling water container 6 of the inner pot 5 so as to surround the lower outer surface thereof, and a ring-shaped flange 17 is formed on the upper outer surface.
Are joined. A support ring 18 is joined to the upper outer surface of the rice grain container 7. In this configuration, as shown by the broken line in FIG. 3, when the hot water container 6 is driven up by the elevating device 8 and mixed with the rice grain storage container 7, the ring-shaped flange 17 of the hot water container 6 is supported by the support ring of the rice grain storage container 7. 18 and the boiling steam is led to the door 4 side. Reference numeral 19 denotes a temperature sensor provided at a contact point with the hot water container 6 on the lifting device 8.

The hot water container 6 must be formed of a material that can withstand the halogen heater 14 at a temperature of about 400 to 500 ° C.
, Specifically, aluminum, stainless steel, enameled steel plate and other heat-resistant, corrosion-resistant and heat conductive metal containers,
Alternatively, a crystallized glass container that can transmit microwaves and withstand high temperature and thermal shock can be suitably used. In the present embodiment, as the hot water container 6, the inner surface of an aluminum container whose surface is coated with a well-known non-adhesive fluorine coating is coated with a black heat-resistant heat ray absorbing metal oxide fine powder, a fluororesin, and a glass bead fine particle. A heat-absorbing film 20, which is appropriately coated with a multi-layer of a conductive silicone resin-based paint, is used.

When the above-mentioned metal hot water container 6 is used, sparks are generated in the hot water container 6 by microwave irradiation, and the hot water container 6 is partially melted and a hole is opened. In addition, a ferrite coating or a cermet coating film that absorbs microwaves and generates heat may be formed in order to prevent uneven heating and safely generate heat by microwave irradiation.

When the main constituent material of the boiling water container 6 is stainless steel, it is preferable to mold a ferritic stainless steel which generates heat by microwaves. Further, when the hot water container 6 is formed of a constituent material having low transmission efficiency such as opaque black glass, it is desirable to form a SnO ₂ -based thin film on the surface. With the hot water container 6 having such a configuration, the outer surface can have both characteristics of black with good heat absorption and good microwave absorption.

Next, the rice cooking process using the rice cooker having the above-described configuration will be described with reference to FIG. 3. First, after the rice cooking is started, the required amount of the rice grains polished in step S21 is measured and measured in the same manner as in the first embodiment. Then, this is put into the rice grain container 7 taken out from the rice cooker main body 1, and water is further added thereto, and the rice is sharpened several times to wash the rice. By leaving it in the immersion state for a predetermined time, specifically 20 minutes to 100 minutes, typically about 1 hour, water absorption necessary for cooking rice is performed in step S22, and after draining in step S23, water is removed in step S2.
Put the washed rice grains R into the rice grain container 7 in step 4,
Fill the hot water container 6 with the water W for cooking that matches the amount of the washed rice grains R.
To Then, the hot water container 6 is set on the elevating device 8, and the rice grain container 7 is set at a predetermined position above the hot water container 6.

Next, after closing the door 4 and sealing the inside of the outer hook 3 in step S25, a power switch (not shown) is turned on to operate the magnetron 10, and microwave irradiation is performed for about 2 to 5 minutes. In step S26, microwaves are simultaneously applied to the boiling water container 6 and the rice grain storage container 7, and the water W in the boiling water container 6 becomes boiling water, and the temperature of the rice grains R in the rice grain storage container 7 is 40 ° C to 80 ° C, And strongly heat until reaching 60 ° C.

In step S27, when the rice temperature and the water temperature reach the above-mentioned temperatures, the power of the magnetron 10 is turned off by the operation of the temperature sensor 19, and the elevating device 8
The hot water container 6 is moved upward by the operation of
And the rice grain container 7 are mixed.

Next, in the first embodiment, the magnetron 10 is turned on to perform heating by microwave irradiation at full power, but in this embodiment, step S2 is performed.
In step 8, the halogen heater 14, which is another heat source, is turned on to
The heating is performed at 98 ° C. or higher by the full power energization heating of 2,000 to 1,200 W at which the starch is gelatinized. Therefore, more delicious rice can be cooked as compared with the first embodiment in which heating is performed at an output of about 800 W of microwaves.

In an area where the power of the magnetron 10 can supply 200V power, it is possible to heat the power up to an output of 1600W using a two-tube magnetron, so that another heat source is unnecessary, but only 100V power can be supplied. In a local area, a two-tube magnetron cannot be used, so that if a different heat source is added as in the present embodiment, rice can be cooked more deliciously.

Finally, in step S29, the output of the halogen heater 14 is controlled, so-called steaming is performed to maintain the temperature of 98 ° C. or higher for 10 minutes or more, so that the starch of the rice grains R is gelatinized and cooked. It will rise. Thereafter, the elevating device 8 is operated to lower the hot water container 6 back to the original position.

In the rice cooking process according to the present embodiment, the halogen heater 1 having an excellent rising speed under the hot water container 6 is provided.
By arranging 4, it is possible to realize a rice cooking process in which the heating source is divided and used properly, and it is possible to cook deliciously.

[0056]

As described above, according to the rice cooking method of the first aspect of the present invention, the washed rice grains are soaked in water for a predetermined time to absorb water, the water-absorbed rice grains are drained, and then heated to a predetermined temperature by microwave heating. Pre-heated rice grains are heated by adding a predetermined amount of water or hot water to the pre-heated rice grains.Rice is washed and irradiated with microwaves to some extent to absorb the water, and the temperature rises from the core by self-heating. By this, swelling is promoted, and rice can be cooked in a short time by making rice in a state where water is easily absorbed. Cooking rice using hot water can further reduce the time.

[0057] In addition, it is possible to less rice unevenness cook to rice in the microwave heating.

According to the second aspect of the present invention, a microwave rice cooker configured to irradiate microwaves into a rice cooker having a microwave leakage preventing structure is provided, and a rice grain container and hot water are supplied to the rice grains in the rice cooker. A hot water supply means is provided, and by this configuration, rice can be cooked according to the method of claim 1, and as a result, in particular, 3 go (0.54 liters) to 1 sho (1.8 liters) cooked rice With a small amount, rice can be cooked in a short time with a minimum amount of water to produce a delicious rice with a stiff, plump texture that has never existed before.

According to the third and fourth aspects, a hot water container provided in the rice cooker and a drive mechanism for displacing the hot water container and the rice grain container relatively to immerse the rice grains in the hot water in the hot water container are provided. Since the hot water supply means is constituted, the rice grains and the hot water which have been independently microwave-heated reach the set temperature, and then the rice grains can be immersed in the hot water by operating the drive mechanism to cook rice.

According to the fifth aspect , the hot water container is disposed below the rice grain container, and a heat source different from the microwave irradiation means is disposed below the hot water container. The advantages of the microwave heating and the advantage of the rising characteristics of another heat source can be used together by separately using them.

According to the sixth aspect of the present invention, the hot water container is formed by applying a black ferrite coating to an outer surface of a metal container which does not transmit microwaves and has good thermal conductivity. Excellent heat conductivity and good thermal conductivity, sharing another heat source
Sometimes it is best.

According to the seventh aspect , since the rice grain storage container is formed of a net-like molded body, the hot water and the rice washing in the rice grain storage container are instantaneously mixed in order to facilitate the entry of the hot water heated to a predetermined temperature. This makes it possible to smoothly perform the subsequent rice starch pregelatinization treatment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a microwave rice cooker in an operation state during preheating and (B) in an operation state during rice heating according to the first embodiment of the present invention.

FIG. 2 is a flowchart of a rice cooking process according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a microwave rice cooker according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a cooking and selling process according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a rice cooking state performed using a conventional microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rice cooker main body 2 Outer box 3 Outer pot 4 Door 5 Inner pot 6 Hot water container 7 Rice grain container 8 Elevating device 9 Water infiltration hole 10 Magnetron 11 Waveguide 12 Irradiation port 13 Transformer 14 Halogen heater 15 Reflector 16 Microwave shielding Ring 17 Ring-shaped flange 18 Support ring 19 Temperature sensor 20 Heat absorption film R Rice grain W Water

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/00 A47J 27/14-27/18 A23L 1/10

Claims (7)

(57) [Claims] 1. The washed rice grains are immersed in water for a predetermined time to absorb water, the water-absorbed rice grains are drained, preheated to a predetermined temperature by microwave heating, and a predetermined amount of boiling water is added to the preheated rice grains to microwave heating. A rice cooking method characterized by cooking rice according to the following. 2. A microwave rice cooker configured to irradiate microwaves into a rice cooker having a microwave leakage preventing structure, wherein the rice cooker has a rice grain container and hot water supply means for supplying hot water to the rice grains. And a microwave rice cooker. 3. The hot water supply means includes a hot water container provided in a rice cooking chamber, and a drive mechanism for relatively displacing the hot water container and the rice grain storage container to immerse the rice grains in the hot water in the hot water container. The microwave rice cooker according to claim 2, wherein 4. A hot water supply means, the hot water container provided in the cooking chamber, micro rice grain container is rotated Configured claim 2, wherein the driving mechanism for introducing rice grains in hot water in the hot water container Wave rice cooker. 5. A hot water container is arranged below the rice grain container, microwaves of the hot water container of another heat source is disposed claim 3 or claim 4, wherein the microwave irradiation means below rice cooker. 6. The microwave rice cooker according to claim 5 , wherein the boiling water container is formed by applying a black ferrite coating to an outer surface of a metal container having good thermal conductivity that does not transmit microwaves. 7. A rice grains container is microwave cooker according to any one of claims 2 to 6 formed by the mesh molded body.