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電動機を内臓した本体と、該本体に回転可能に保持され、前記電動機により回転駆動される鋸刃と、前記本体下部に取付けられ、前記鋸刃の一部を底面より突出可能な構成をし、被切削材上を摺動するベースと、前記本体と前記ベースとを連結する支点部と、前記ベースあるいは前記本体に設けられ、前記支点部を中心とした円弧状の長穴を有するべベルプレートと、該べベルプレートの長穴を介して該べベルプレートと前記本体あるいは前記ベースに設けられた連結部材とを連結させる締結部材とを有し、前記本体に対して前記ベースを前記支点部を支点として回動させることにより前記鋸刃と前記ベース底面との角度を調整可能な携帯用丸鋸機において、前記べベルプレートの長穴は径寸法の大きい第１長穴と、該第１長穴と連結して形成され該第１長穴の径寸法よりも径寸法の小さい第２長穴とを有し、前記第１長穴は前記鋸刃と前記ベース底面との角度が４５度の際に前記締結部材が当接する端部を有することを特徴とする携帯用丸鋸機。A main body with a built-in electric motor, a saw blade rotatably supported by the main body and driven to rotate by the electric motor, and a structure attached to the lower portion of the main body so that a part of the saw blade can protrude from the bottom surface; A base that slides on a workpiece, a fulcrum part that connects the main body and the base, and a bevel plate that is provided on the base or the main body and has an arc-shaped elongated hole centered on the fulcrum part And a fastening member for connecting the bevel plate and a connecting member provided on the main body or the base through an elongated hole of the bevel plate, and the base is connected to the fulcrum portion with respect to the main body. In the portable circular saw machine in which the angle between the saw blade and the base bottom surface can be adjusted by rotating about a first fulcrum, the elongated hole of the bevel plate has a first elongated hole having a large diameter, and the first Connected with long hole By a second elongated hole smaller diameter than the diameter of the first long hole, the first elongated hole has the coupling member when the angle is 45 degrees and the base bottom surface and the saw blade A portable circular saw machine having an abutting end. 前記締結部材は、前記連結部材に前記支点部を中心とした径方向に延びる連結穴に回動不能且つ前記支点部を中心とした径方向に移動可能に係合するボルトと、該ボルトとねじ嵌合するチョウナットとを有することを特徴とする請求項１記載の携帯用丸鋸機。 The fastening member includes a bolt that is non-rotatably engaged with a connecting hole extending in a radial direction centered on the fulcrum portion and movably engaged in a radial direction centered on the fulcrum portion, and the bolt and screw. The portable circular saw machine according to claim 1, further comprising a butterfly nut to be fitted.