PROBLEM TO BE SOLVED: To provide an electromotive toothbrush constituted so as to be simplified in its structure while having the function of exhausting an internal gas.SOLUTION: The electromotive toothbrush is equipped with a cylindrical case 11 having a secondary cell housed therein, the cover 20 for closing the opening end part of the case 11, the male screw part 30 for fixing the case 11 and the cover 20 and characterized in that a through-hole 21, which permits the shaft part of the male screw part 30 to pass when the case 11 and the cover 20 are fixed, is provided to the cover 20 to be utilized as a passage for exhausting the gas in the case 11 to the outside, and a waterproof member 40 equipped with ventilation properties closing the passage is provided.COPYRIGHT: (C)2009,JPO&INPIT【課題】内部のガスを排気する機能を備えつつ、構造の簡略化を図った電動歯ブラシを提供する。【解決手段】内部に二次電池が収納される筒状のケース11と、ケース11の開口端部を塞ぐカバー20と、ケース11とカバー20とを固定するおねじ部品30と、を備える電動歯ブラシであって、カバー20には、ケース11とカバー20を固定する際におねじ部品30の軸部が通過する貫通孔21が設けられており、貫通孔21はケース11内部の気体を外部に排気させる通路としても利用されると共に、該通路を塞ぐ通気性を備えた防水部材40が設けられることを特徴とする。【選択図】図3
