An endoscope power supply system (1) includes an endoscope (2) and a housing apparatus (3) to which the endoscope is detachably connected. The housing apparatus (3) includes a plurality of LDO regulators (321, 322, 323, 324) configured to output electric power different from one another, switches each provided in an output stage of each of LDO regulators (321, 322, 323, 324) and each formed of two FETs that are back-to-back connected, and a controller (33) selects an LDO regulator necessary to operate the endoscope (2) from the LDO regulators (321, 322, 323, 324), and controls the switches to output electric power generated by the selected LDO regulator unit to the endoscope (2).
