A compact flash (CF) card includes, in a front portion, a space-entering portion that enters the space between a top plate and a bottom plate provided on the upper and lower sides of connecting terminal pins arranged at the front end of a CF-card storage section of a PC card adapter. The connecting terminal pins are protected by the top plate and the bottom plate. The CF card storage section of the PC card adapter has an opening in the upper surface on the card insertion side. An upper portion of the CF card that is exposed from the opening includes a tall portion having a greater height than the space-entering portion. The CF card can be loaded in a PC card adapter having a simple structure, and taller electronic components can be mounted in the tall portion, than in a CF card which is equal in height to the space-entering portion over the entire range from the front end to the rear end.