According to one embodiment, a USB port for connecting a note PC to an external device includes a rib structure that faces an opening formed in a side wall of the housing of the note PC and receives a gasket. The rib structure includes a frame member surrounding the gasket, and a plurality of ribs. The frame member has a cutout formed in a portion thereof remote from the side wall. When the gasket is pressed and elastically deformed by the receptacle of a connector, the deformed portion of the gasket escapes through the cutout.