To reduce a size of an electric power source transformer, and to reduce a size of a direct current high-voltage power source device.

In this direct current high-voltage power source device, the power source transformers 2 are arranged laterally to array three legs 6 of an iron core 4 substantially horizontally so as to be supported from a grounding potential part, three voltage doubler rectifying circuits 20 are supported in an upper side of respective secondary coils 12 of the power source transformers 2 by providing respectively insulated support columns between respective base plates 42 and the iron cores 4 of the power source transformers 2, and the respective secondary coils 12 are suspended respectively from the base plates 42 of the respective voltage doubler rectifying circuits 20 corresponding thereto, to be supported.