In order to provide a highly-reliable battery pack that has resistance to vibration, a battery pack of the present invention is characterized by including a plurality of unit batteries 100 stacked and bonded together with a two-sided adhesive tape 460, the unit batteries 100 including a laminate film casing material by which an electrode laminated body that includes a sheet positive electrode, a sheet negative electrode, and a separator, and an electrolytic solution are sealed, wherein a total outer circumference length of the two-sided adhesive tape 460 is longer than an outer circumference length of an electrode laminated area 105 that is an area corresponding to a location where the electrode laminated body is stored in the laminate film casing material.