A light source device 12 for endoscope includes: an irradiation portion 38 capable of radiating excitation light； a rotating body 35 provided on an optical axis of the excitation light and configured to rotate with a rotating shaft 34 as a center； a phosphor 36 arranged in an irradiation area of the excitation light in the rotating body, and configured to generate fluorescence by being irradiated with the excitation light； a light quantity control portion 31 configured to control irradiation intensity or irradiation time of the excitation light； and a rotation control portion 46 configured to perform rotation control of increasing a rotation cycle of the rotating body when increasing the irradiation intensity or the irradiation time of the excitation light by the light quantity control portion, and perform rotation control of reducing the rotation cycle of the rotating body when reducing the irradiation intensity or the irradiation time of the excitation light by the light quantity control portion.
