A power device includes a battery module for fixing a connecting terminal to an end and a bus bar connected to the connecting terminal of the battery module. The connecting terminal includes a fixing plate portion fixed to the end of the cell, an outer cylindrical portion protruded cylindrically from the fixing plate portion, an end face plate portion closing a tip surface of the outer cylindrical portion, and an inner cylindrical portion protruded from the end face plate portion toward the fixing plate portion. The connecting terminal is provided with a female screw on an internal surface of the inner cylindrical portion and a setscrew penetrating through the bus bar is screwed toward the female screw, and the bus bar is fixed to the connecting terminal through the setscrew.