Patent ID: 8056175

Claim:
A toothbrush device comprising: a grip including a coupler shaft and a power supply; a brush member including a receptacle for receiving the coupler shaft for connection with the grip, wherein the brush member further includes an electric terminal accommodation chamber and an electric terminal plate accommodated in the electric terminal accommodation chamber, the electric terminal plate includes a contact, which comes into contact with a contact portion of the coupler shaft through a window providing communication with the receptacle, and the electric terminal plate is supplied with power from the power supply through the contact and the coupler shaft; the brush member includes a holding portion which supports the coupler shaft at a side opposite the contact portion in the receptacle; the receptacle has an inlet including an engaging piece, which upon completion of insertion of the coupler shaft resiliently returns to substantially its original shape and engages the coupler shaft, and a fastener mount portion, which faces toward the engaging piece, and the engaging piece cooperates with the fastener mount portion to hold the coupler shaft therebetween; and the engaging piece and the contact portion are arranged at the same side of an axis of the coupler shaft, and the fastener mount portion is arranged opposite the contact portion with respect to the axis of the coupler shaft.