A measuring method and a measuring apparatus which can classify and count myeloblast more precisely without influence of other component in a sample including platelet aggregation in measurement of a blood sample with a flowcytometry, wherein damage is given to a cell membrane of erythrocyte and mature leukocyte contained in a hematological sample, a hemocyte in which a cell membrane is damaged is constricted, and this is dyeing-treated with a fluorescent dye which can stain a nucleic acid to obtain a sample, the sample is measured with a flowcytometer, and a cell contained in a first cell group containing myeloblast, which is specified based on forward scattered light information and side scattered light information, and contained in a second cell group containing myeloblast, which is specified based on forward scattered light information and fluorescent information, is counted as myeloblast.