To effectively protect a printed circuit board from ultrasonic vibration or shock in simple structure and reduce the failure of mounted electronic components.

This pack battery contains a printed circuit board 1 in a case 3 through a cushioning body 6 made of a rubber elastic body. Interposing recesses 7 of a plurality of cushioning bodies 6 are locally fit to the periphery of the printed circuit board 1. The tip of a stopper projection 9 formed in the case 3 locally comes in contact with the supporting surface 8 on the opposite side of the interposing recess 7. The cushioning body 6 is supported with the stopper projection 9 of the case 3, and the printed circuit board 1 is supported with the cushioning body 6.