To provide an ultra-miniaturized, thin-sized memory card provided with a mechanism for preventing a wrong insertion to a memory card slot.

The multi-function memory card 1 is composed of a card body A and a cap 1B for housing the card body. The card body 1A is made of mold resin that encapsulates plural semiconductor chips mounted on a main surface of a wiring substrate. The card body 1A is housed into the cap 1B with the back face of the wiring substrate facing outward. Guide channels are provided at both side faces of the cap 1B for preventing that the card is inserted upside down. Further, a convex section 1C is provided at the trailing edge of the cap for preventing that the card is inserted in the wrong direction.