A wall stands upright from the surface of the bottom plate in the vertical direction in an electronic apparatus. An opening is defined in the wall. A connector defines a cylindrical portion located in the opening to receive a plug. A rib stands upright from the surface of the bottom plate. The rib defines a lock surface and an inclined surface. The lock surface extends in the vertical direction so as to hold the connector between the wall and the lock surface itself. The inclined surface is connected to the upper end of the lock surface. When the connector is set within the enclosure, the connector is received on the inclined surface. The connector slides on the inclined surface. The cylindrical portion enters the opening. When the connector drops off the inclined surface, the connector is fitted between the lock surface and the wall.