Abstract: A plate shaped battery pack includes: a power generating element (21) sealed by a wrapping member (22) formed in the shape of a wrapper constructed of a laminated film; an anode terminal (24a, 26, 39) and a cathode terminal (23a, 23c, 25, 35) connected to the power generating element (21) and extending from almost a middle portion thereof; and an exterior member (10, 50, 80). The exterior member has a support member (15, 17, 55, 85) in a protruding shape supporting the anode terminal or the cathode terminal; or a recess (72, 76, 83) receiving a seal portion (22d) of the wrapping member. Furthermore, the plate shaped pack has a construction in which the exterior member is electrically conductive and surrounds the wrapping member, and one of the anode terminal and the cathode terminal are electrically connected to thereto, or another construction including, in addition, a temperature detector connected to a heat transfer member.