BATTERY PACK

A plurality of batteries is effectively prevented from catching fire, while suppressing an effect on an outside of a battery pack caused by a jetting body, such as high-temperature gas or flame, jetted from the battery. The battery pack includes: a plurality of battery cells (1) each formed by closing an opening of a bottomed cylindrical outer can (11) with a sealing plate; a battery holder (2) to hold the plurality of battery cells (1) in a mutually parallel attitude and hold electrode terminals (13) provided at both ends of each battery cell (1) in an attitude disposing on a same plane; and an outer case (4) to house a battery assembly (10) formed by holding the plurality of battery cells (1) in the battery holder (2). The battery holder (2) includes: a holding part (6) to hold the ends of the plurality of battery cells (1) along outer peripheral surfaces of the outer cans (11); and a cover (7) to cover an end surface side of the plurality of battery cells (1) held by the holding part (6). When the battery cell (1) is abnormal, the cover (7) is deteriorated by energy of a jetting body jetted from an end surface of the battery cell (1).