The disclosure aims to reduce current consumption while suppressing degradation in image resolution. An optical scanning observation apparatus 10, comprising: a light source selectively emitting a plurality of lights of different colors a light emission timing controller 32 controlling light emission timing, based on a predetermined ratio of number of light emissions of each color of light emitted from the light source a fiber 11 guiding light from the light source an actuator 21 vibratory driving the tip part of the fiber an optical system 25a, 25b for irradiating light emitted from the fiber an optical detector 35 and a signal processor 37.
