<P>PROBLEM TO BE SOLVED: To provide a flow cytometer capable of enhancing an electrical signal of fluorescence generated when biological particles are excited by the second light, by adding electrically electrical signal output from a plurality of second acceptance. <P>SOLUTION: The flow cytometer is characterized by including a flow cell forming sheath flow containing colored biological particles, first and second light sources irradiating first and second lights sequentially to the flow cell, first and second acceptance receiving scattered light or fluorescence from biological particles due to the first light and the second light to convert into electrical signal, and a signal processing unit enhancing electrical signal of fluorescence generated when biological particles are excited by the second light, by adding electrically electrical signal output from a plurality of second acceptance during a predetermined period from the time of receiving scattered light or fluorescence by the first acceptance. <P>COPYRIGHT: (C)2011,JPO&INPIT 
FLOW CYTOMETER AND FLOW CYTOMETRY METHOD