Provided is an electric toothbrush (10) in which a head portion (34) of a replaceable brush (30) has a reduced size in the front-rear direction so that operability of the head portion (34) in an oral cavity can be improved, and the frictional resistance between a brush head (40) and a neck body (32) and vibration of the brush head (40) are reduced so that stability of action of the brush head (40) can be improved and power consumption can be reduced. The brush head (40) is provided on the front surface at a distal-end-side part of a neck (31) of the replaceable brush (30). A fitting shaft portion (45) is provided on a planting base (42) of the brush head (40) so as to protrude rearward and penetrate through a support wall portion (37) of the neck (31). A shaft hole (41a) is formed at a rotation center of a brush head body (41) of the brush head (40) so as to extend frontward from a rear surface of the brush head body (41). The neck (31) has a head support shaft (49) mounted to the shaft hole (41a) so as to rotatably support the brush head (40). A front end of the head support shaft (49) is located frontward of a rear surface of the planting base (42), and power from the driving portion (13) is transmitted to a rear part of the fitting shaft portion (45).
