A solar panel mounting for installing a solar cell panel on a folded-plate roof. The pivot pin can be moved from a retracted position, in which the pivot pin is not engaged in the pivot pin receptacle, by vertical displacement into an extended position in which the pivot pin is engaged in the pivot pin receptacle and is rotatably supported therein. For example, in a case where the calculated movement speed exceeds a permissible speed set in advance, retreat processing is performed for moving the optical pickup or the lens included in the optical pickup apart from a surface of the optical disc.