Cells showing specific characters can be separated from noise, extracted, and analyzed, through processing of a cell image. It is intended to provide a cell image processor (1) comprising: a characteristic quantity measuring section (11) which processes a cell image obtained by photographing cells to measure characteristic quantities of respective cells in the cell image; a characteristic quantity distribution forming section (12) which forms the distribution of the thus measured characteristic quantities; a group forming section (13) which divides cells having continuously distributed characteristic quantities into groups in the thus formed characteristic quantity distribution; and a specific cell extracting section (14) which extracts cells having characteristic quantities falling within a predetermined range at both ends of a characteristic quantity distribution in each group, as specific cells.