PROBLEM TO BE SOLVED: To provide an electric toothbrush which can reduce power consumption without lowering cleanability while being constituted to be able to switch between a rotary type and a slide type, and which can constitute a head part thin.SOLUTION: In an electric toothbrush including head side conversion means 50 for converting a reciprocation linear motion of an output shaft of driving means into a reciprocation rotary motion of a brush head, the head side conversion means 50 includes: a connection rod 51 capable of performing reciprocation linear motion together with an output shaft an oscillation lever 52 which is arranged between the connection rod 51 and a brush head body 41, and in which a base part on the connection rod 51 side is pivotally supported at a handle body 31 in a rotatable manner a first conversion mechanism 53 for converting a reciprocation linear motion of the connection rod 51 into a reciprocation rotary motion of the oscillation lever 52 and a second conversion mechanism 54 for converting the reciprocation rotary motion of the oscillation lever 52 into the reciprocation rotary motion of the brush head body 41.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2018,JPO&INPIT【課題】回転式とスライド式とに切り替え可能に構成しつつ、清掃性を低下させることなく消費電力を低減でき、しかもヘッド部を薄型に構成可能な電動歯ブラシを提供する。【解決手段】駆動手段の出力軸の往復直線運動をブラシヘッドの往復回転運動に変換するヘッド側変換手段50を備えた電動歯ブラシにおいて、ヘッド側変換手段50は、出力軸とともに往復直線運動可能な連結棒51と、連結棒51とブラシヘッド本体41間に配置されて、連結棒51側の基部が柄体31に回転自在に枢支された搖動レバー52と、連結棒51の往復直線運動を搖動レバー52の往復回転運動に変換する第1変換機構53と、搖動レバー52の往復回転運動をブラシヘッド本体41の往復回転運動に変換する第2変換機構54とを備えた。【選択図】図6
