To propose a heat dissipation mechanism and the like, capable of enhancing the workability furthermore when mounting, as compared with prior art.

A clip 5 for pressing power elements Q1-Q6 against a heat slinger 4 includes: a substantially rectangular back plate portion 5A; legs 5B, 5C which are the parts extending, respectively, from the parts on both sides of the back plate portion 5A facing each other, while narrowing the interval toward the tip, and pressing the power elements Q1-Q6 against the heat slinger 4; and an operating portion 5G extending from the legs 5B, 5C in the extension direction of the long side of the back plate portion 5A, and against which a jig 7 for widening the interval abuts.