To improve the memory mount efficiency of a memory card and to reduce the product cost and failure rate of a memory card adapter by integrating a selection switch inputted to a controller selection circuit with a stopper hook to be used for position fixation of the memory card and exerting both a switch function and a stopper function.

The memory card 1 has a first memory card controller 2, a second memory card controller 3, a controller switch circuit 4, and a stopper recessed part 5 with the selection switch. A shape transformation adapter 11 is provided with a stopper projecting part 12 with the selection switch. When the memory card 1 is inserted into the shape transformation adapter 11 and the stopper projection part 12 with selection switch is engaged with the stopper recessed part 5 with selection switch, the memory card 1 is positioned and the memory card controller are switched and selected.

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