A sealed cell 20 includes an electrode body 22 and a bottomed cylindrical outer casing can 50 that accommodates the electrode body. The outer casing can is formed by nickel-plated iron, and a lead connected to one of a cathode and an anode and the outer casing can are welded by a welding part 54 formed from the outside surface of the outer casing can toward the lead. The welding part 54 is formed by traces of fusion and has a first layer 56 and a second layer 58 having a higher nickel concentration than the first layer 56. The first layer 56 is formed from the lead through to the inside of the outer casing can, the second layer 58 is formed so as to adjoin the first layer 56 on the outside surface side of the outer casing can, and the whole of the first layer 56 is covered with the second layer 58 when the welding part is viewed from the outside of the outer casing can.