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Pub. No.:    WO/2018/199081    International Application No.:    PCT/JP2018/016585
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 25 01:59:59 CEST 2018
IPC: A61C 17/22
A61C 17/34
Applicants: SUNSTAR INC.
Inventors: WADA Yukinori
和田 行紀
[Problem] To provide an electric toothbrush (10) in which the operability of a replaceable toothbrush (30) head part (34) inside the mouth can be improved by configuring the head part (34) in a small size in the front-back direction, and furthermore, the stability of operation of a brush head (40) can be improved and power consumption can be reduced by reducing the friction resistance of the brush head (40) and a handle body (32) and the vibration of the brush head (40). [Solution] The brush head (40) is provided on the front surface side of the tip side portion of a handle body (31) of the replaceable toothbrush (30). A fitting shaft part (45) protruding rearward and passing through a support wall part (37) of the handle body (31) is provided on a bristle planting base (42) of the brush head (40). A shaft hole (41a) extending forward from the rear surface of a brush head body (41) is formed in a rotation center of the brush head body (41) of the brush head (40). A head support shaft (49) attached to the shaft hole (41a) and rotatably supporting the brush head (40) is provided on the handle body (31). In addition, the front end section of the head support shaft (49) is disposed further forward than the rear surface of the bristle planting base (42) to transmit power from a drive part (13) to the rear section of the fitting shaft part (45).