A blood cell analyzer comprising: a flow cell configured to flow a measurement specimen containing blood cells; a first light source configured to emit light having a first wavelength of greater than or equal to 400 nm and smaller than or equal to 435 nm on the measurement specimen; a second light source configured to emit light having a second wavelength of greater than or equal to 610 nm and smaller than or equal to 750 nm on the measurement specimen; a first light receiving portion (D4, 205a) configured to receive first forward scattered light generated by irradiating the blood cells in the measurement specimen with light from the first light source; a second light receiving portion (D4, 205b) configured to receive second forward scattered light generated by irradiating the blood cells in the measurement specimen with light from the second light source; a third light receiving portion (D5, D54b) configured to receive side scattered light generated by irradiating the blood cells in the measurement specimen with light from the second light source; a fourth light receiving portion (D6, D63; D2, D72) configured to receive auto-fluorescence generated by irradiating eosinophils in the measurement specimen with light from the first light source; and a control section configured to: differentiate white blood cells from the blood cells contained in the measurement specimen, based on a detection signal output from the first light receiving portion and a detection signal output from the second light receiving portion; classify the differentiated white blood cells into a plurality of types including lymphocytes, monocytes, and granulocytes, based on a detection signal output from the second light receiving portion and a detection signal output from the third light receiving portion (D5, D54b); and specify eosinophils from the classified granulocytes, based on a detection signal output from the first light receiving portion (D4, 205a) and a detection signal output from the fourth light receiving portion (D6, D63; D2, D72). a flow cell configured to flow a measurement specimen containing blood cells; a first light source configured to emit light having a first wavelength of greater than or equal to 400 nm and smaller than or equal to 435 nm on the measurement specimen; a second light source configured to emit light having a second wavelength of greater than or equal to 610 nm and smaller than or equal to 750 nm on the measurement specimen; a first light receiving portion (D4, 205a) configured to receive first forward scattered light generated by irradiating the blood cells in the measurement specimen with light from the first light source; a second light receiving portion (D4, 205b) configured to receive second forward scattered light generated by irradiating the blood cells in the measurement specimen with light from the second light source; a third light receiving portion (D5, D54b) configured to receive side scattered light generated by irradiating the blood cells in the measurement specimen with light from the second light source; a fourth light receiving portion (D6, D63; D2, D72) configured to receive auto-fluorescence generated by irradiating eosinophils in the measurement specimen with light from the first light source; and a control section configured to: differentiate white blood cells from the blood cells contained in the measurement specimen, based on a detection signal output from the first light receiving portion and a detection signal output from the second light receiving portion; classify the differentiated white blood cells into a plurality of types including lymphocytes, monocytes, and granulocytes, based on a detection signal output from the second light receiving portion and a detection signal output from the third light receiving portion (D5, D54b); and specify eosinophils from the classified granulocytes, based on a detection signal output from the first light receiving portion (D4, 205a) and a detection signal output from the fourth light receiving portion (D6, D63; D2, D72). differentiate white blood cells from the blood cells contained in the measurement specimen, based on a detection signal output from the first light receiving portion and a detection signal output from the second light receiving portion; classify the differentiated white blood cells into a plurality of types including lymphocytes, monocytes, and granulocytes, based on a detection signal output from the second light receiving portion and a detection signal output from the third light receiving portion (D5, D54b); and specify eosinophils from the classified granulocytes, based on a detection signal output from the first light receiving portion (D4, 205a) and a detection signal output from the fourth light receiving portion (D6, D63; D2, D72).