The sample is irradiated with the first light pulse at the first repetition frequency, and the second light pulse having an optical frequency different from that of the first light pulse is irradiated in synchronization with the first light pulse at the second repetition frequency. In the stimulated Raman scattering microscope apparatus that detects, as a detection light pulse train, a light pulse having a first repetition frequency included in detection light from the sample in response to irradiation with the second light pulse, the second light pulse is transmitted at a plurality of optical frequencies. A predetermined light pulse including a predetermined number of light beams, and a light pulse having a predetermined predetermined number of different light frequencies out of the divided light pulses is adjusted to be output at the second repetition frequency, and the adjusted light pulse is Generated by combining.
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