Patent ID: 8512048

Claim:
An expansion device adapted to be attached/detached to an attachment face of an electronic device where a connection terminal is present, the expansion device comprising: an attachable face adapted to be opposed to the attachment face of the electronic device when the expansion device is attached to the electronic device; a terminal on the attachment face, adapted to be connected electrically with the connection terminal; a magnet adapted to exert an attraction force on a predetermined position in the attachment face of the electronic device; and a support portion adapted to support a face adjacent to the attachment face of the electronic device, wherein when the attachable face of the expansion device is opposed to the attachment face of the electronic device and the expansion device is brought into contact with the attachment face of the electronic device, the magnet is drawn to the electronic device to be at the predetermined position and the terminal and the connection terminal are connected electrically to each other, whereby the support portion supports the face adjacent to the attachment face of the electronic device.