To improve the heat-releasing ability of a structure for mounting a reactor on a cooling base.

A reactor mounting structure comprises a closed-loop shaped core 1 having opposing coil winding portions, coils 2 formed on the coil winding portions, and a cooling base 5 on which the core 1 having the coils 2 is mounted. The structure is also equipped with a pressing member (pressing plate 3) to be in contact with at least one of the coils 2 and the core 1 and, between the opposing coils 2, a connecting member (connecting bolts 4) for connecting the pressing member and the cooling base 5 and securing the core 1 having the coil 2 to a place between the pressing member and the cooling base 5. There is provided no case for accommodating the core 1 on which core is formed.

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