An object of the present invention is to provide an electric toothbrush with a thinner handle part to ensure the ease of manual tooth-brushing while improving the ease of a switch operation between the operating state and the stopped state, the electric toothbrush being configured to realize an effective oral cleaning by automatically giving a necessary mechanical assistance to a brush part according to the brushing state constantly varying during tooth-brushing depending on the cleaned part and the ways of holding and moving the toothbrush. The electric toothbrush includes: a toothbrush main body (2) having a brush part (15) and a handle part (20) for manually operating the brush part (15)； a vibration generation means (3) that vibrates the brush part (15)； an acceleration sensor (4) that detects a manual brushing action； and a control means (5) that controls at least the vibration generation means (3).
