A plurality of specific external connecting parts can be short-circuited, without increasing the number of parts and mounting work. A plurality of external connecting parts provided in parallel to each other, and a short-circuit part for short-circuiting edges located at rear end side of each of a first external connecting part and a second external connecting part which separate external connecting parts not short-circuited among the external connecting parts are inserted therebetween are comprised. The short-circuit part is formed by upward or downward bending process, and has a curved part.