To provide an electric toothbrush capable of reducing the transmission of vibrations accompanying the rotation of an electric motor to a grip part.

In an inner side case 10, an eccentric weight 19 is positioned on the side of the tip part of the electric toothbrush main body 1 and the electric motor 18 is disposed. The inner side case 10 is abutted to the inner surface of the tip part of an electric brush main body 1. Also, a thin part 5 is formed in a peripheral direction between a position to which the inner side case 10 is abutted on the electric toothbrush main body 1 and the grip part 9, and a coating layer 7 coating the outer periphery of the thin part 5 with a shake-proof material is formed.