Abstract: A flow cytometer includes: a light source; a microfluidic device; a photodetector; an information generation device which generates optical information indicating a morphology of an observation target on the basis of optical signal intensity; and a spatial light modulation unit which is installed on an optical path between the light source and the photodetector and structures any one of illumination light irradiated from the light source toward the flow path and signal light from the observation target.

Abstract: A flow cell of the flow cytometer of the present invention includes: a sample flow path through which a sample fluid containing a sample flows; and a sample fluid supply portion which communicates with an upstream end of the sample flow path in the sample fluid flow direction and supplies the sample fluid to the sample flow path, wherein the sample fluid supply portion includes a plurality of sample opening portions which supply a sample fluid to the sample flow path, a cleaning liquid supply opening portion to which a second tube is connectable and which supplies a cleaning liquid for cleaning the sample fluid supply portion, and a cleaning liquid discharge opening portion to which a first tube is connectable and which discharges the cleaning liquid from the sample fluid supply portion.