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 that closes an opening of the housing space. Here, battery cover includes only positive electrode terminal out of a negative electrode terminal electrically connected to a negative electrode of the battery and positive electrode terminal electrically connected to a positive electrode of the battery. Then, the body includes the negative electrode terminal electrically connected to positive electrode terminal of battery cover through the battery.