An electrical device may be provided with: a housing having a side surface; and a connector opening provided on the side surface of the housing and to which a connector is connected. The side surface includes a groove surrounding the connector opening, the connector includes a ring-shaped rib fitted into the groove, the connector has an upper surface and a lower surface that are inclined as viewed along a normal direction of the side surface, and a lower end of the lower surface includes a step protruding downward, the side surface includes a drain hole at a position below the step, and the drain hole communicates inside of the groove and underside of the groove.