Examples are metals and metal oxides such as silver, aluminum, and aluminum oxide, and resins such as silicone, acryl, epoxy, and urethane each containing thermally conductive additives. [0119] When a predetermined solar radiation amount is given to the solar cell module 2101 (not shown) in which the power converter 2107 shown in FIG. 4 is integrated with the solar cell module main body 110, the p