PURPOSE: To prevent malfunction of an electrical equipment which is generated when switching power by initializing the control of the electrical equipment according to the switching operation of a switching means for switching first and second power supplies for supplying power to the electrical equipment.

CONSTITUTION: In a body part 51a, a size AA bakery which is connected in series via a coil terminal 21 by a magazine is loaded, 2CR-type battery 2 is loaded into a grip part 51b, and a switching unit 52 is laid out between both batteries 1 and 2. The negative electrode of the size AA type battery 1 contacts a first fixed terminal 3 and supplies power to a camera (electrical device) from the size AA type battery 2 via a connector 53. The connection between the positive electrode of the size AA type battery 2 and a first movable terminal 5 is cut, the negative electrode of 2CR5 type battery 2 contacts a second fixed terminal 4, and the 2CR type battery 2 supplies power to a camera via the connector 53. Then, the control of the camera is initialized by switching the batteries 1 and 2 using a switching unit 52, thus preventing the malfunction of the camera.