Problem to be solved: to make the head portion (34) of the brush (30) small in the front and rear direction, and to improve the operability of the head part (34) in the oral cavity, and to reduce the frictional resistance between the brush head (40) and the handle body (32) and the vibration of the brush head (40), thereby reducing the brush head (4) An electric toothbrush (10) capable of improving the stability of operation of 0 and reducing power consumption is provided.A brush head 40 is provided on the front side of the front end portion of the handle body 31 of the brushThe back of the brush head 40 protrudes rearwardA fitting shaft portion (45) penetrating the support wall portion (37) of the handle body (31) is provided.A shaft hole (41a) extending forward from the rear surface of the brush head body (41) is formed at the rotation center of the brush head body (41) of the brush head (40)；In the handleMounted on shaft holeA head support shaft (49) for rotatably supporting a brush head (40) is provided.A front end portion of a head support shaft (49) is disposed in front of the rear surface of the beveled plateA power from the driving portion (13) is transmitted to the rear portion of the fitting shaft portion (45).【課題】替えブラシ（３０）のヘッド部（３４）を前後方向に小型に構成して、口腔内におけるヘッド部（３４）の操作性を向上でき、しかもブラシヘッド（４０）と柄本体（３２）との摩擦抵抗とブラシヘッド（４０）の振動を減らして、ブラシヘッド（４０）の作動の安定性を向上するとともに消費電力を低減し得る電動歯ブラシ（１０）を提供する。【解決手段】替えブラシ（３０）の柄体（３１）の先端側部分の前面側にブラシヘッド（４０）を設け、ブラシヘッド（４０）の植毛台（４２）に後方へ突出して、柄体（３１）の支持壁部（３７）を貫通する嵌合軸部（４５）を設け、ブラシヘッド（４０）のブラシヘッド本体（４１）の回転中心にブラシヘッド本体（４１）の後面から前方へ延びる軸孔（４１ａ）を形成し、柄体（３１）に、軸孔（４１ａ）に装着されて、ブラシヘッド（４０）を回転自在に支持するヘッド支軸（４９）を設け、ヘッド支軸（４９）の前端部を植毛台（４２）の後面よりも前側に配置し、嵌合軸部（４５）の後部に駆動部（１３）からの動力を伝達する。
