Scanning endoscope device including a light source unit that repeatedly emits a plurality of illumination beams in different wavelength bands in a certain order with a predetermined repetition period； a light guiding section that has an emission surface； a driving section that oscillates the emission surface in two axial directions in a reciprocating manner to two-dimensionally scan the illumination beams； a controller that controls the source unit and/or the driving section so that an oscillation period and a oscillation amplitude of the emission surface are proportional to the period of the illumination beams, and that controls the driving section so that the oscillation period periodically and gradually changes and the oscillation period is proportional to the oscillation amplitude； a light detecting section that detects return beams； and an image generating section that generates images of the return beams in synchronization with the predetermined period of the source.
