A sharp image showing a thin projecting part is acquired without using a complex dyeing method, and the analysis accuracy is improved. An automatic cell analyzer (1) comprises: an imaging unit (4) for capturing fluorescence emitted from a cell (S) and acquiring a cell image; an exposure changing section (5) for changing the exposure condition when the imaging unit (4) captures cell images; and a processing section (5) for analyzing the cell (S) on the basis of a plurality of cell images respectively captured under the changed exposure conditions.