To provide an electric toothbrush which enables quick and efficient cleaning and sterilization of the oral cavity.

When the electric toothbrush 1 is used in the oral cavity, available chlorine can be generated electrolytically using chloride ions in the oral cavity so that the available chlorine can be efficiently utilized for the sterilization in the oral cavity. Also, since electrodes 35a and 35b disposed at a head section 3 are formed to oscillate, the generation efficiency of the available chlorine can be increased while the cleaning of the oral cavity is executed, and the generated available chlorine can be instantly diffused in a liquid in the oral cavity. Thereby, the available chlorine comes to have the effective concentration for the sterilization in a short time and instantly spreads all over the oral cavity so that the cleaning and the sterilization of the oral cavity can be quickly and efficiently executed.