Disclosed is a cell analyzer comprising: a measuring device that includes a collecting section configured to collect target cells in a specimen with a filter, and is configured to measure the target cells collected by the collecting section; and a data processing device configured to analyze the target cells based on measurement data obtained by the measuring device, wherein the cell analyzer is operable in a first mode of measuring a clinical specimen collected from a subject and a second mode of measuring a quality control specimen containing particles having size capturable by the filter; and the data processing device is programmed to acquire an amount of particles collected by the collecting section based on measurement data of the quality control specimen obtained in the second mode, and output an alarm when the amount of particles meets a predetermined condition.
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