Abstract: A prismatic battery having high volumetric efficiency and good airtightness is achieved. The prismatic battery comprises a prismatic battery can, a power-generating element inserted into the prismatic battery can, which power-generating element is obtained by winding a belt form of positive electrode sheet and a belt form of negative electrode sheet with a separator interleaved therebetween, and an electrode header for sealing the prismatic battery can. The electrode header comprises a metal sheet having through-hole in a portion recessed in an upper surface thereof, through which an electrical connecting terminal passes, and insulating sheets provided on upper and lower surfaces of the recessed portion for making insulation between the metal sheet and the electrical connecting terminal. The electrical connecting terminal is crimped for fixation to the metal sheet, and is electrically connected to one electrode sheet of the power-generating element.