The present invention is to present a sample analyzer which is capable of displaying a particle distribution map of a measured sample and a reference particle distribution map so as to be visually compared without reducing a display area for displaying information other than the particle distribution map. The blood analyzer 1 comprises: a display 302; a measurement unit 2 for measuring a blood sample; and a controller 301 being configured to 1) generate a particle distribution map representing a distribution of the particles contained in the blood sample, based on measurement data obtained by the measurement unit 2; and 2) control the display 302 so as to display the particle distribution map of the blood sample at a predetermined display position and to display a reference particle distribution map at the predetermined display position so as to be visually compared with the particle distribution map of the blood sample.