Patent ID: 8793829

Claim:
An electric toothbrush comprising: an inner case which is mounted with components including a drive source; an outer case which interiorly accommodates the inner case, and which becomes a portion a user grips with hand when brushing teeth; an eccentric shaft which center of gravity is arranged at a position shifted from a shaft center and which rotates by a drive force of the drive source; and a vibration transmitting component which transmits a vibration generated with a rotation of the eccentric shaft to a brush portion, wherein the vibration transmitting component is positioned with respect to the outer case by point contacting an inner wall surface of the outer case at a plurality of locations, and the vibration transmitting component includes, a stem, made from a hard material, arranged with an eccentric shaft bearing; a holder, made from a hard material, arranged so as not to contact the stem and fixed to the inner case; and an elastic member having an interposing portion interposed so as to be sandwiched between the stem and the holder, and a plurality of projecting portions that point contacts the inner wall surface of the outer case.