<p>A toothbrush device (1) including a brush member (3) and a grip (2). The brush member includes an electric terminal accommodation chamber (23) and an electric terminal plate (24) accommodated in the electric terminal accommodation chamber. The electric terminal plate includes a contact (24a), which comes into contact with a contact portion (C) of a coupler shaft (16) of the grip through a window (31a) providing communication with a receptacle (22) of the brush member. The brush member includes a holding portion (31) supporting the coupler shaft. The receptacle includes a fastener mount portion (33) and an engaging piece (32) which cooperates with the fastener mount portion to hold the coupler shaft therebetween. The engaging piece (32) and the contact portion (C) are arranged at the same side of the axis (L) of the coupler shaft (16). The fastener mount portion (33) is arranged opposite the contact portion (C) with respect to the axis (L) of the coupler shaft (16).</p>
