A cell analyzer for analyzing an epithelial cell collected from an uterine cervix, comprising: a flow cell in which a measurement sample including a measurement target cell flows, wherein the measurement target cell is the epithelial cell, of which the nucleus is selectively stained by propidium iodide; a light source part for irradiating a light on the measurement sample flowing in the flow cell , wherein the light source part is a semi-conductor laser; an optical system for forming a beam spot on the measurement sample flowing in the flow cell , the beam spot having a diameter of 3-8 μm in a flow direction of the measurement sample and a diameter of 300-600 μm in a direction perpendicular to the flow direction of the measurement sample; and a light receiving part for receiving a light from the measurement sample, wherein the light receiving part comprises a scattered light detector for detecting a scattered light from the measurement sample flowing in the flow cell , and a fluorescent light detector for detecting a fluorescent light from the measurement sample flowing in the flow cell , and wherein the cell analyzer further comprises: a signal processing part configured to obtain a value reflecting a size of the nucleus of the epithelial cell from a value of a pulse width of a fluorescent light signal output from the fluorescent light detector , and for obtaining a value reflecting an amount of DNA in the nucleus of the epithelial cell from the pulse area of the fluorescent signal output from the fluorescent light detector ; and an analyzing part configured to determine whether or not the epithelial cell is abnormal, based on the value reflecting the size of the nucleus of the epithelial cell and the value reflecting the amount of DNA in the nucleus of the epithelial cell obtained from the signal processing part. a flow cell in which a measurement sample including a measurement target cell flows, wherein the measurement target cell is the epithelial cell, of which the nucleus is selectively stained by propidium iodide; a light source part for irradiating a light on the measurement sample flowing in the flow cell , wherein the light source part is a semi-conductor laser; an optical system for forming a beam spot on the measurement sample flowing in the flow cell , the beam spot having a diameter of 3-8 μm in a flow direction of the measurement sample and a diameter of 300-600 μm in a direction perpendicular to the flow direction of the measurement sample; and a light receiving part for receiving a light from the measurement sample, wherein a signal processing part configured to obtain a value reflecting a size of the nucleus of the epithelial cell from a value of a pulse width of a fluorescent light signal output from the fluorescent light detector , and for obtaining a value reflecting an amount of DNA in the nucleus of the epithelial cell from the pulse area of the fluorescent signal output from the fluorescent light detector ; and an analyzing part configured to determine whether or not the epithelial cell is abnormal, based on the value reflecting the size of the nucleus of the epithelial cell and the value reflecting the amount of DNA in the nucleus of the epithelial cell obtained from the signal processing part. <EOS>