SEALING STRUCTURE FOR BATTERY

A sealing structure for a battery includes a plate shaped member having a through hole, a polymer molding, and an electrode. The polymer molding has a tube portion provided along an entire edge of the through hole, and a base portion provided on the tube portion. The electrode has a column portion disposed on an inner periphery of the tube portion, and a plate portion provided on the column portion. A back surface of the plate shaped member contacts a front surface of the base portion. A front surface of the plate portion contacts a back surface of the base portion. At least one of the back surface of the plate shaped member and the front surface of the plate portion has an annular projection provided around the through hole and projecting toward the base portion.