PURPOSE: To perform mounting without extending lead wires to a cooler head while performing electric test by a socket by branching one signal wire into the leads for electric test having large lead intervals and the leads for mounting having small lead intervals.

CONSTITUTION: A package main body 1 is provided with two kinds of mutually corresponding leads such as the leads 2a for mounting and the leads 2 for electric test for being mounted on a cooler head 4. The leads 2 for electric test and the leads 2a for mounting correspond one-to-one, and the corresponding leads are relatively connected in the inside of the main body 1. And, the leads 2a for mounting are used for mounting while the leads 2 for electric test are connected through sockets for being given electric test.