A cool air flow path space in which cool air flows in the housing is provided by an internal fan (14) disposed in the housing (2). The magnetic component (20) placed on the bottom (7a) of the housing is fixed by the mounting member (30) at a position where the cold air flows from the internal fan in the cold air passage space. The mounting member guides the top plate (30a) contacting the top surface of the magnetic component, a pair of legs (30b) extending downward from the top plate and fixed to the bottom, and the cold air flowing from the internal fan into the magnetic component. It is a metal plate material provided with the guide plate (30e, 30f) to do.
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