The present invention achieves a coupling mechanism which allows for more efficient dissipation of heat generated by the heat generating element, as compared with a conventional coupling mechanism. A coupling mechanism (1) includes: a plate-like member group (11) including (i) a first plate-like member (11_2) which is joined to a heat generating element (92) and (ii) a second plate-like member (11_1) which is joined to a radiator (91); and a shaft member (12) configured to hold the first plate-like member and the second plate-like member (11_1, 11_2) so as to allow the first plate-like member and the second plate-like member (11_1, 11_2) to rotate on a shared axis which is orthogonal to main surfaces of the respective first and second plate-like members (11_1, 11_2). The main surface of the first plate-like member (11_2) is in plane contact with the main surface of the second plate-like member (11_1).