It is an object to provide a medical light-source device capable of securing a long illumination time required for being used in operations in the medical field, a medical light-source device is worn on the body of the operator to apply light to a target portion of the medical treatment, and has a battery power supply section 60, and a control section 54 feeds a rated value of current from the battery power supply section 60 to an LED illumination section 61 to emit by a first switch 55A being operated, and when the second switch 55B or 55C is operated, changes an average current value fed to the LED illumination section 61 to supply an increase value of current higher than the rated value for a predetermined time to increase the quantity of irradiated light for the period. Further, an acceleration sensor 80 is provided so as to control illuminance corresponding to a motion of the operator.
