There is provided an optical-emission-signal output apparatus for outputting an optical-emission signal specifying an optical-emission timing to an optical-emission unit for outputting light to an optical-scan unit for scanning incident light by resonance. The optical-emission-signal output apparatus comprises a frequency divider for dividing a master clock output at predetermined intervals, a delay-time setting unit for specifying one of a plurality of delay times, and a signal output unit for outputting the optical-emission signal in accordance with a result of division by the frequency divider and a delay time specified by the delay-time setting unit.