Provided is an oral cleansing device including a battery housing that can be downsized. The oral cleansing device according to the present disclosure includes a battery housing capable of housing a battery and is driven by the battery. The battery housing includes a body having a housing space in which the battery is housed, and battery cover (12) that closes an opening of the housing space. Here, battery cover (12) includes only positive electrode terminal (18) out of a negative electrode terminal electrically connected to a negative electrode of the battery and positive electrode terminal (18) electrically connected to a positive electrode of the battery. Then, the body includes the negative electrode terminal electrically connected to positive electrode terminal (18) of battery cover (12) through the battery.