JP4682560B2 - Rear body structure of the vehicle - Google Patents

Description

  The present invention relates to a rear vehicle body structure of a vehicle, and more specifically to a rear vehicle body structure in which an opening corresponding to a back door is provided in a rear wall of the vehicle body, and belongs to the technical field of the vehicle body structure.

  In general, in a vehicle, a plurality of openings that are opened and closed by a door are provided in the vehicle body. However, if such openings are provided, the rigidity of the vehicle body tends to be lowered.

  As a technique for coping with this reduction in rigidity, for example, in Patent Document 1, a sedan type vehicle having a trunk room opening at a rear part of a vehicle body includes a reinforcing member extending rearward from the side of a rear wheel suspension tower. What is provided in the side wall of the vehicle body is disclosed.

  Further, in Patent Document 2, as a technique for improving the rigidity of the rear part of the vehicle body, in a vehicle having rear pillars extending upward from the upper parts of the left and right rear wheel houses, a vehicle width direction along the upper surfaces of the rear wheel houses and floor members is described. And a reinforcing member that extends to the left and right and reaches the left and right rear pillars is disclosed.

JP-A-5-16837 Japanese Patent Application No. 2004-8111

  By the way, in the case of a vehicle in which an opening corresponding to the back door is provided on the rear wall of the vehicle body, the rigidity of the rear wall of the vehicle body decreases due to the large opening, and consequently the torsional rigidity of the rear portion of the vehicle body also decreases. However, the reinforcing member described in Patent Document 1 is mainly for the purpose of reinforcing the rear side wall of the vehicle body, and the reinforcing member of Patent Document 2 is mainly for the purpose of reinforcing the floor member at the rear side of the vehicle body. In a vehicle such as a hatchback vehicle having an opening in the vehicle, it is not possible to obtain a sufficient effect for ensuring the torsional rigidity of the rear portion of the vehicle body.

  Accordingly, an object of the present invention is to provide a rear vehicle body structure capable of improving the torsional rigidity of the rear portion of the vehicle body in a vehicle in which an opening is formed in the vehicle body rear wall so as to correspond to the back door.

  In order to solve the above-mentioned problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) includes an opening formed on the rear wall of the vehicle body so as to correspond to the back door, and a vehicle body front side separated from the vehicle body rear wall by a predetermined distance. A rear wheel house formed so as to bulge inward from the side wall of the vehicle body, a reinforcing member extending in the vehicle width direction along the rear wheel house and the floor member, and both ends reaching the upper portions of the left and right rear wheel houses, The floor member has a rear end joined to the rear wall of the vehicle body, a side end in the vehicle width direction joined to a lower portion of the rear wheel house, and The vehicle body side wall extends in the front-rear direction of the vehicle body side in the vehicle width direction, and the side portion of the vehicle body side wall is joined to the side wall and protrudes inward in the vehicle width direction. On the wheelhouse Preparative with connecting members made of a plate member in plan view a substantially rectangular shape for coupling is provided a, the said connecting member and the reinforcing member, the rear wheel house the mounting portion of the rear suspension device in the upper part of the rear wheel house It is characterized by being polymerized and linked in a triple manner.

  The invention according to claim 2 of the present application (hereinafter referred to as second invention) is characterized in that, in the first invention, the connecting member extends obliquely upward from the rear wheel house toward the rear wall of the vehicle body. To do.

In the invention according to claim 3 of the present application (hereinafter referred to as third invention), in the first invention or the second invention, the reinforcing member has a hat shape in cross section having a flange, and the flange is an upper surface of the floor member. An upper reinforcing member joined to the floor is provided, and the upper reinforcing member and the floor member form a closed cross section.

Further, in the invention according to claim 4 of the present application (hereinafter referred to as the fourth invention), in the third invention, the reinforcing member has a hat shape in cross section having a flange, and the flange is joined to the lower surface of the floor member. includes a lower reinforcing member, along with the closed section between the lower reinforcement member and the floor member is formed, the vehicle body front side flange of the vehicle body rear side flange and the lower reinforcing member of the upper reinforcing member or the vehicle body of the upper reinforcing member, The front side flange and the vehicle body rear side flange of the lower reinforcing member are superposed via a floor member.

  Next, the effect of the present invention will be described.

First, according to the first invention, since the reinforcing member has a U-shaped structure between the left and right wheel houses, the left and right vehicle body side walls are less likely to bend to the side of the vehicle body, and the connecting member and the reinforcing member are the rear wheel house. Therefore, the rigidity of the peripheral portion of the opening in the rear wall of the vehicle body is improved, and as a result, the torsional rigidity of the entire rear portion of the vehicle body is improved. Further, since the reinforcing member is provided along the rear wheel house and the floor member, the indoor space at the rear of the vehicle body is not damaged by the reinforcing member. And since especially the said reinforcement member and a connection member are connected by the attachment part of the rear suspension apparatus in a rear wheel house upper part, it becomes a triple structure by this reinforcement part, a connection member, and a rear wheel house. The rigidity is improved and the load of the vehicle body and the like transmitted from the suspension can be reliably supported.

  According to the second invention, since the connecting member extends obliquely upward from the rear wheel house toward the rear wall of the vehicle body, the range of high rigidity can be expanded to a higher position on the rear wall of the vehicle body.

  According to the third aspect of the present invention, the closed cross section is formed by the upper reinforcing member and the floor member, whereby the rigidity of the floor member is improved, and consequently the rigidity of the rear portion of the vehicle body is improved.

  Further, according to the fourth aspect of the present invention, the load applied to the upper reinforcing member that is transmitted from the vehicle body or the like to the upper portion of the wheel house via the suspension can be distributed to the lower reinforcing member. And the vehicle body front side flange of the lower reinforcement member, or the vehicle body front side flange of the upper reinforcement member and the vehicle body rear side flange of the lower reinforcement member are overlapped via the floor member. Compared to the case where the front and rear flanges are overlapped and joined, the reinforcing range of the floor member can be expanded in the longitudinal direction of the vehicle body, and the workability of welding, for example, can be improved by reducing the number of triple structures. Can be improved.

  Embodiments of the present invention will be described below.

  1 is an overall perspective view of the rear body of the vehicle according to the present embodiment as seen through obliquely from the front side of the vehicle body, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along line B-B, FIG. 4 is a cross-sectional view taken along line C-C in FIG. 1, and FIG. 5 is a cross-sectional view taken along line D-D in FIG. These drawings show a state in which an indoor trim or the like is not attached. Further, in these drawings, only one side wall side is shown, but the other side wall side also has a symmetrical structure, and the description thereof is basically omitted.

  As shown in FIG. 1, the vehicle body rear part of the vehicle 1 according to the present embodiment constitutes, as main components, a floor part 2 that constitutes the bottom surface of the vehicle body, a side wall part 3 that constitutes the side surface of the vehicle body, and a rear surface of the vehicle body. It has a rear wall portion 4 and a roof portion 5 constituting the upper surface of the vehicle body.

  A semicircular rear wheel house portion 6 that bulges inwardly of the vehicle body is provided at the lower portion of the side wall portion 3 among the above portions. An opening 8 corresponding to the back door 7 is provided in the rear wall portion 4.

  A rear pillar portion 9 extending obliquely upward from the vicinity of the rear wheel house portion 6 is provided above the rear wheel house portion 6 in the side wall portion 3, and in front of the rear pillar portion 9 in the side wall portion 3. An opening 10 for passengers is provided, and a side window opening 11 is provided behind the rear pillar 9. A roof rail portion 13 is provided at the upper end of the side wall portion 3 so as to extend from a pillar portion (not shown) positioned most forward of the vehicle body to a pillar portion 12 positioned most rearward of the vehicle body. 13 is connected to the end of the roof portion 5 in the vehicle width direction.

  Next, the structure of the side wall portion 3 and the like will be described in detail. As shown in FIGS. 2 and 3, the side wall portion 3 is configured as a hollow body by an inner panel 21 and an outer panel 22, and the inside Is provided with a rear pillar reinforcement 23 (hereinafter referred to as “rear pillar rain 23”). As shown in FIGS. 2 and 3, the rear pillar rain 23 has a flange 23 a at the lower end joined to a substantially central portion in the vehicle width direction of the bulging portion 21 a that bulges toward the outer panel 22 at the lower portion of the inner panel 21. As shown in FIG. 1, it extends in a substantially vertical direction while being inclined toward the front side of the vehicle body toward the rear pillar portion 9, and the upper end portion is joined to the roof rail portion 13 through the rear pillar portion 9. In addition, joining means the coupling | bonding by welding etc., and is used by the same meaning hereafter.

  Further, as shown in FIG. 1, the rear pillar rain 23 has a cross-sectional hat shape having a bulging portion 23b bulging toward the outer panel 22 and flanges 23c and 23d at the front end portion and the rear end portion. The flanges 23c and 23d are joined to the inner panel 21 to form a closed cross section.

  As shown in FIG. 4, in the rear pillar portion 9, the front end portion and the rear end portion of the inner panel 21, the outer panel 22, and the rear pillar rain 23 are superposed to form a triple structure. A closed cross section is formed. In addition, superposition | polymerization means the coupling | bonding by welding etc. similarly to joining, and is used by the same meaning hereafter.

  Further, as shown in FIG. 1, the rear pillar rain 23 extends along the front edge 11a and the lower edge 11b of the side window opening 11, and the portion along the front edge 11a is shown in FIG. As described above, the inner panel 21, the outer panel 22, and the rear pillar rain 23 are superposed in a triple manner as described above, and the inner panel 21 and the outer panel are also formed in the portion along the lower edge 11b as shown in FIG. 22 and the rear pillar rain 23 are polymerized in triplicate. According to this, the rigidity of the corner portion 3a (see FIG. 1) where the front end edge portion 11a and the lower end edge portion 11b intersect in the side wall portion 3 is improved.

  The rear wheel house part 6 has the rear wheel panel 24 in which the bulging part 24a to the vehicle interior side was formed, as shown in FIGS. A flange 24b is formed around the bulging portion 42a of the rear wheel panel 24, and the flange 24b is joined to the lower portion of the vertical surface portion 21b of the inner panel 21 as shown in FIGS. Yes.

As shown in FIG. 1, the rear wall portion 4 includes an end inner panel 61 and an end outer panel (not shown), and flanges of the panels are joined to each other at the end portion along the opening 8.
As shown in FIGS. 1 and 2, the floor portion 2 includes a flat floor panel 31. A frame member 32 extending in the front-rear direction of the vehicle body is joined below the end of the floor panel 31 on the side wall 3 side. The floor panel 31 has a flange 31a at the end on the side wall 3 side, and the flange 31a is superposed on the side surface of the bulging portion 24a of the rear wheel panel 24 via the vertical surface portion 32a of the frame member.

  As shown in FIG. 1, between the left and right rear wheel house parts 6, it extends in the vehicle width direction along the upper surfaces of both rear wheel house parts 6 and the floor part 2, and both ends thereof are the left and right rear wheel house parts 6. Reinforcing member 40 reaching the upper part is provided. The reinforcing member 40 is U-shaped when viewed from the rear (or front) side of the vehicle body, and includes left and right upper wheel house reinforcements 41 (hereinafter referred to as “upper rain 41”) and a lower wheel house reinforcement. Ment 42 (hereinafter, “lower rain 42”) and upper cross member 43, which will be described below.

  First, as shown in FIGS. 1 to 3, the upper rain 41 is disposed on the upper portion of the rear wheel panel 24, and a bulging portion 41 a that bulges from the upper portion to the lower portion toward the vehicle body inner side. Are provided with flanges 41b, 41c, 41c, 41d, and 41d, and have a cross-sectional hat shape. The flange 41b is joined to the vertical surface portion 21b of the inner panel 21, the flanges 41c and 41c are joined to the upper surface of the bulged portion 24a of the rear wheel panel 24, and the flanges 41d and 41d are bulged portion 24a of the rear wheel panel 24. As shown in FIG. 2, a closed section is formed by the bulging portion 41 a and the bulging portion 24 a of the rear wheel panel 24.

  The lower rain 42 connects the upper rain 41 and the floor panel 31, is disposed below the upper rain 41, and has a bulging portion 42 a that bulges inward in the vehicle body at a substantially central portion in the width direction. It has flanges 42b, 42b provided on both sides in the width direction, and has a cross-sectional hat shape. Then, with the lower part of the bulging part 41 a of the upper rain 41 and the upper part of the bulging part 42 a of the lower rain 42 fitted together, the upper parts of the flanges 42 b and 42 b are placed below the flanges 41 d and 41 d of the upper rain 41. While being joined, the lower portions of the flanges 42 a and 42 a are joined to the upper surface of the floor panel 31.

  The upper cross member 43 connects the left and right lower rains 42, has a bulging portion 43a that extends in the vehicle width direction along the upper surface of the floor panel 31 and bulges upward, and flanges 43b and 43b. The cross section is hat-shaped. The flanges 43b and 43b are joined to the upper surface of the floor panel 31, and the upper cross member 43 and the floor panel 31 form a closed cross section. Further, at both ends in the vehicle width direction of the upper cross member 43, the end portions in the vehicle width direction of the bulging portion 43a of the upper cross member and the lower portion of the bulging portion 42a of the lower rain 42 are joined together. ing.

  As shown in FIG. 5, a floor cross member 44 extending in the vehicle width direction is disposed on the lower surface of the floor panel 31. The floor cross member 44 has a bulging portion 44a that bulges downward, and flanges 44b and 44b, and has a hat shape in cross section. The flanges 44b and 44b are joined to the lower surface of the floor panel 31, and the floor cross member 44 and the floor panel 31 form a closed cross section. The vehicle body front side flange 43 b of the upper cross member 43 and the vehicle body rear side flange 44 b of the floor cross member 44 are superposed via the floor panel 31.

  Returning to FIG. 1, a connecting gusset 51 extending obliquely upward along the side wall portion 3 from the upper portion of the rear wheel house 6 toward the peripheral portion 4 a of the opening 8 in the vehicle body rear wall 4 is provided at the rear of the rear wheel house 6. It is arranged. The connection gusset 51 is a plate member having a substantially rectangular shape in plan view, and includes a flat surface portion 51a and flanges 51b, 51c, 51d, and 51e formed by bending the flat plate portion 51a. Then, the side flange 51b on the side wall 3 side is joined to the inner panel 21 on the side wall 3, the side flange 51c on the rear wall 4 side is joined to the inner panel 61 on the rear wall 4, and the rear wheel. A flange 51d on the side of the house portion 6 is joined to the upper surface of the bulging portion 24a of the rear wheel panel 24. The flange 51e on the side opposite to the side wall 3 is intended to improve the rigidity of the connecting gusset 51, and is bent downward unlike the other flanges 51b, 51c, 51d.

  Further, an extension 51f is provided on the side of the connecting gusset 51 on the rear wheel house 6 side, and the extension 51f is joined to the upper surface of the bulging portion 41a of the upper rain 41 so as to connect the connecting gusset 51 and the upper gusset 51. In 41 is connected. Therefore, in this connection part, the rear wheel panel 24, the upper rain 41, and the connection gusset 51 are superposed in a triple manner. A suspension device for the rear wheel is attached by inserting and fastening a bolt and nut member into a hole H provided in the overlapping portion.

  Next, the effect | action which concerns on this Embodiment is demonstrated.

  First, from the viewpoint of reinforcing the rear part of the vehicle body, since the reinforcing member 40 has a U-shaped structure between the left and right rear wheel house parts 6, the left and right side wall parts 3 are less likely to bend to the side of the vehicle body, and the connecting gusset Since 51 and the reinforcing member 40 are connected at the upper part of the rear wheel house portion 6, the rigidity of the opening peripheral portion 4a in the rear wall portion 4 is improved, and as a result, the torsional rigidity of the entire rear portion of the vehicle body is improved. Further, since the reinforcing member 40 is provided along the upper surfaces of the rear wheel house portion 6 and the floor portion 2, the reinforcing member 40 does not impair the indoor space at the rear of the vehicle body.

  Further, since the connecting gusset 51 extends obliquely upward from the rear wheel house portion 6 toward the opening peripheral portion 4a in the rear wall portion 4, it is possible to widen the range of high rigidity to a higher position in the rear wall portion 4. it can.

  Furthermore, the reinforcing member 40 has a cross-sectional hat shape having a flange, and the flange is joined to the upper surface of the floor portion 2 to form a closed cross section between the reinforcing member 40 and the floor portion 2. The rigidity of the part 2 is improved, and consequently the rigidity of the rear part of the vehicle body is improved.

  And since the reinforcement member 40 and the connection gusset 51 are connected by the attachment part of the suspension apparatus in the upper part of the rear wheel house part 6, in this connection part, the reinforcement member 40, the connection gusset 51, and the wheel house panel 24 are connected. As a result, a triple structure is obtained, the rigidity is improved, and the load of the vehicle body and the like transmitted from the suspension can be reliably supported.

  Next, from the viewpoint of dispersion of the vehicle body load transmitted from the suspension to the rear wheel house part 6, the load is transmitted from the upper part of the rear wheel house part 6 through the connecting gusset 51 to the peripheral part of the opening in the rear wall part 4. 4 a, and also to the side wall portion 3 including the rear pillar portion 9 through the rear pillar rain 23. That is, the load can be effectively distributed over a wide range at the rear of the vehicle body.

  In that case, the opening peripheral part 4a in the rear pillar part 9 and the rear wall part 4 is formed by joining a plurality of panel members, and is very rigid, so that it can effectively receive the dispersed load. Can do.

  Further, the rear pillar rain 23 has a wider area in the side wall portion 3 than the case where the load transmitted to the rear wheel house portion 6 is not inclined because the upper portion is inclined toward the front side of the vehicle body. It is possible to effectively disperse the wheel house portion 6 to the front side of the vehicle body.

  Since the rear pillar rain 23 extends along the front edge 11a and the lower edge 11b of the side window opening 11, the side window opening 11 is most often used when the side window opening 11 is provided. The vicinity of the corner portion 3a where the front end edge portion 11a and the lower end edge portion 11b of the opening 11 cross close to the suspension and stress is likely to concentrate is reinforced, and the rigidity of the side wall portion 3 is improved.

  Furthermore, since the rear pillar rain 24 is connected to the roof rail portion 13, the load transmitted to the rear wheel house portion 6 can be distributed to the roof portion 5 via the roof rail portion 13.

  Moreover, since the connection gusset 51 is joined to the side wall part 3 between the upper part of the rear wheel house part 6 and the opening peripheral part 4a in the rear wall part 4, the load input to the rear wheel house part 6 is It can also be dispersed in the side wall portion 3 behind the rear wheel house portion 6.

  Further, since the connecting gusset 51 extends obliquely upward from the upper part of the rear wheel house part 6 toward the rear wall part 4, the connecting gusset extends substantially horizontally rearward in the load transmitted to the rear wheel house part 6. It is possible to effectively disperse the rear portion of the side wall portion 3 relative to the rear wheel house portion 6 rather than the case where the side wall portion 3 is. That is, in the rear part of the rear wheel house part 6 in the side wall part 3, due to the large area of the rear wheel house part 6 itself, the above load is applied in a range substantially equal to or less than the rear wheel house part 6. Although a sufficient area for dispersion cannot be secured, according to the present embodiment, the connecting gusset 51 extends obliquely upward from the upper portion of the rear wheel house portion 6 toward the rear wall portion 4, and therefore the rear wheel house portion. The load can be transmitted and distributed to a portion having a larger area at the rear of 6.

  Further, since the reinforcing member 40 that connects the upper portion of the rear wheel house portion 6 and the floor portion 2 in the substantially vertical direction of the vehicle is provided, the load transmitted to the rear wheel house portion 6 is transmitted via the reinforcing member 40. It can also be distributed to the floor portion 2. At this time, the connecting gusset 51, the rear pillar rain 23, and the reinforcing member 40 realize a Y-shaped reinforcing structure, so that the load input to the rear wheel house 6 is evenly distributed to each part of the rear vehicle body. be able to.

  Further, since the vehicle body front side flange 43b of the upper cross member 43 of the reinforcing member 40 and the vehicle body rear side flange 44b of the floor cross member 44 are overlapped via the floor panel 31, a load applied to the reinforcing member 40 from the suspension is applied. Compared to the case where the upper cross member 43 and the front and rear flanges 43b, 43b, 44b, 44b can be overlapped and joined to each other, the floor portion 2 can be reinforced. The range can be expanded in the longitudinal direction of the vehicle body, and workability such as welding can be improved by reducing the number of triple-structured portions.

In the above-described embodiment, the lower rain 42 of the reinforcing member 40 extends to the lower part of the upper rains 41, 41. However, the following reference example may be used. That is, as shown in FIG. 6, the upper end portion of the lower rain 142 having a cross-sectional hat shape having a bulging portion 142 a extending from the upper end portion to the lower end portion and a flange 142 b is used as the bulging portion 141 a of the upper rain 141 of the reinforcing member 140. And an extension 142c extending to the lower portion of the extension 151f of the connecting gusset 151, and as shown in FIG. 7, the extension 151f of the connecting gusset 151, the extension 142c of the lower rain 142, and the upper rain 141d are provided. And the upper part of the bulging part 124a of the rear wheel panel 124 is superposed four times, and the suspension device is fixed by inserting and fastening a bolt and nut member into a hole H 'provided in the superposed part. According to this, the rigidity of the fixing portion of the suspension device is further improved. Further, a continuous closed cross section from the floor portion 102 to the upper portion of the rear wheel house portion 106 is formed by the upper surface portion of the bulging portion 124a of the rear wheel panel 124 and the lower rain 142, and the torsional rigidity of the rear portion of the vehicle body is further improved. It will be.

In the above embodiment, when the flange 43b of the upper cross member 43 and the flange 44b of the floor cross member 44 are overlapped with each other via the floor member 31, the vehicle body front side flange 43b of the upper cross member 43 and the floor cross Although the vehicle body rear side flange 44b of the member 44 is overlapped, the vehicle body rear side flange 43b of the upper cross member 43 and the vehicle body rear side flange 44b of the floor cross member 44 may be overlapped.

  The present invention can be widely applied to a rear body structure of a vehicle in which an opening is provided in the rear wall of the vehicle body.

1 is an overall perspective view of a rear body of a vehicle according to an embodiment of the present invention seen through obliquely from the front side of the vehicle body. It is AA arrow sectional drawing of FIG. It is a BB arrow directional cross-sectional view of FIG. It is CC sectional view taken on the line of FIG. It is DD sectional view taken on the line in FIG. 1 is an overall perspective view of a rear body of a vehicle according to a reference example of the present invention seen through obliquely from the front side of the vehicle body. FIG. 7 is a cross-sectional view taken along line EE in FIG. 6.

Explanation of symbols

1 vehicle 3 side wall (vehicle body side wall)
4 Rear wall (car body rear wall)
4a Opening peripheral part in the rear wall (opening peripheral part in the vehicle rear wall)
6 Rear wheel house (Rear wheel house)
7 Back door 8 Opening 31 Floor panel 40 Reinforcement member (upper reinforcement member)
44 Floor cross member (lower reinforcing member)
51 Connection gusset (connection member)

Claims (4)

An opening formed on the rear wall of the vehicle body so as to correspond to the back door, a rear wheel house formed to bulge inwardly from the vehicle body side wall on the front side of the vehicle body at a predetermined distance from the rear wall of the vehicle body, A vehicle rear body structure provided with a reinforcing member extending in the vehicle width direction along the rear wheel house and the floor member and having both ends reaching the upper portions of the left and right rear wheel houses, the floor member having a rear end It is joined to the rear wall of the vehicle body, the side edge in the vehicle width direction is joined to the lower part of the rear wheel house, and extends in the vehicle front-rear direction on the vehicle width direction inner side of the vehicle body side wall. coupling member set which part is a plate member in plan view a substantially rectangular shape that connects the opening peripheral portion and the rear wheel house upper part of the vehicle body rear wall in a state of being joined to the side wall projecting in the vehicle width direction inner side Together are, The said connecting member and the reinforcing member, the vehicle, characterized in that it is connected are polymerized in triplicate, including the rear wheel house the mounting portion of the rear suspension device in the upper part of the rear wheel house Rear body structure.   The rear body structure of the vehicle according to claim 1, wherein the connecting member extends obliquely upward from the rear wheel house toward the rear wall of the vehicle body.   The reinforcing member has a cross-sectional hat shape having a flange, and includes an upper reinforcing member in which the flange is joined to the upper surface of the floor member, and the upper reinforcing member and the floor member form a closed cross section. The rear body structure of the vehicle according to claim 1 or 2, wherein the vehicle body structure is a rear body structure.   The reinforcing member has a cross-sectional hat shape having a flange and includes a lower reinforcing member in which the flange is joined to the lower surface of the floor member, and the closed cross-section is formed by the lower reinforcing member and the floor member, The vehicle body rear side flange of the upper reinforcing member and the vehicle body front side flange of the lower reinforcing member, or the vehicle body front side flange of the upper reinforcing member and the vehicle body rear side flange of the lower reinforcing member are superposed via the floor member. The rear body structure of a vehicle according to claim 3, wherein the vehicle body structure is a rear body structure.

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