PROBLEM TO BE SOLVED: To provide an electric toothbrush capable of preventing its lid from being mistakenly taken off in use.SOLUTION: In a battery containing section 13, an electric toothbrush 1 includes: a battery case 131 for holding a battery 30 a case engagement part 134 fixed to the battery case 131 a cylinder-shaped battery case lid 135 to be engaged with the rear end opening of a handle 11 a grip member 136 composed of a grip part 136a rotatably attached to a flat bottom face of the battery case lid 135 which is formed perpendicular to the longitudinal direction of the battery case lid engaged with the proximal end of a toothbrush body 10, and a lid hook part 136b to be caught after the case engagement part 134 and the grip part 136a are rotated only prescribed degrees with respect to each other and an O-ring 139 which is placed around the outer surface of the battery case lid 135, and comes in contact with the inner surface of the handle 11 when the battery case lid 135 is engaged with the rear end opening of the handle 11.COPYRIGHT: (C)2012,JPO&INPIT【課題】電動歯ブラシの使用中に、誤って蓋を外すことを防止できる電動歯ブラシを提供すること。【解決手段】電動歯ブラシ1は、電池収容部13において、電池30を収容する電池ケース131と、電池ケース131に固定されたケース係合部134と、ハンドル11の後端の開口に係合する略円筒形状の電池蓋135と、歯ブラシ本体10の後端に係合する電池蓋135の長手方向に直交する面に形成された底部において回転可能に設けられた把持部136aと、ケース係合部134と把持部136aが所定角度だけ回転することにより係合する蓋爪部136bと、を有する把持部材136と、電池蓋135の外周壁に配置され、ハンドル11の後端の開口に電池蓋135が係合したときに、ハンドル11の内壁に接するオーリング139と、を備えた。【選択図】図2
