To provide a confocal scanner system using a filter wheel unit capable of intermittently switching a filter at a high speed (for example, switching cycle of ≤33ms).

Regarding the confocal scanner system including an exiting filter wheel and a light receiving filter wheel wherein a plurality of filters having a region for transmitting light of desired wavelength are arranged at fixed angle intervals along a circumferential direction, respective filter wheels are intermittently, cooperatively and rotationally driven by a stepping motor which is driven by a pulse signal of a trapezoidal driving pattern consisting of three steps, that is, an acceleration time area where the frequency of the driving pulse is linearly increased from a starting frequency to an operating frequency, a normal operation time area where the operating frequency is maintained, and a reduction time area where the frequency is linearly reduced from the operation frequency to the starting frequency.