An oral cleaning device includes: a wash water production tank in which wash water to be fed into an oral cavity is produced and stored a water feed mechanism including a water feed channel having one end connected to the wash water production tank, a carrier configured to carry the wash water in the wash water production tank into the water feed channel, and a release unit connected to an outlet end of the water feed channel to release the wash water into the oral cavity and an electrical discharge generator which includes a pair of electrodes for inducing streamer discharge in water, and a power supply configured to apply a voltage to the pair of electrodes, and is configured to produce hydrogen peroxide in the water by the streamer discharge.
