An X-ray generating apparatus comprises a storage housing, an insulating housing arranged in the storage housing, an X-ray generating tube arranged at least partly in the insulating housing, and a plurality of electrical components arranged in the insulating housing. In the X-ray generating apparatus, the plurality of electrical components include a mold transformer, the mold transformer includes a core, an insulator covering the core, and a heat-dissipating path configured to move heat from the core to an external space of the insulator, and the heat-dissipating path includes a hole provided in the insulator to extend from the external space toward the core.