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. [0136] When a predetermined solar radiation amount is given to the solar cell module 3101 (not shown) in which the power converter 3107 shown in FIG. 5 is integrated with the solar cell module main body 110, the p