1. A perimeter for measuring a visual field of a subject eye by conducting predetermined perimetry operations for two or more measurement points of the subject eye, comprising: a memory that stores perimetry results; a perimetry result indicator that composes the perimetry result as a map image that corresponds to a fundus and indicates it on a display; an structure examination image indicator that obtains a structure examination image of the subject eye on which the perimetry is conducted and indicates the obtained image on the display; a composite image preparing means that superimposes the map image on the displayed structure examination image and indicates the superimposed on the display as a composite image; a concerned area setter that sets a concerned area on the composite image; and an evaluation value computer that computes an evaluation value of the perimetry regarding the concerned area based upon the perimetry result and outputs it.