To improve workability in the case of fixing and increase sufficiently a heat dissipation effect from a heat dissipating member.

A heating element 1 can be connected thermally with the heat dissipating member 11, without screw-setting the heating element by connecting directly a part between the heat dissipating member 11 and the heat generating element 1 by solder without using a conventional heat dissipating sheet and press metal fittings. A hole for inserting the press metal fittings is not formed in the heating element 1 or the heat dissipating member 11, so that a connection area of the heating element 1 and the heat dissipating member 11 is increased. As a result, the heat dissipating member 11 can take heat away effectively from the heating element 1 and dissipate the heat to the outside.