A medical light-source device for securing a long illumination time required for operations in the medical field, has an LED illumination section including an LED element； a holder to put the LED illumination section on a head of the operator； a battery power supply section that supplies power to the LED illumination section； a charger having an AC adaptor capable of being connected to a commercial power supply for charging the battery power supply section； and a battery holding belt to put the battery power supply section and the charger on the body of the operator. The battery holding belt has a switch section to switch on/off the LED illumination section and to adjust intensity of illumination of the LED element； and a control section to control a constant current, which is associated with the intensity of illumination, supplied to the LED illumination section.
