A perimeter 2 for measuring a visual field by conducting perimetry operations regarding measurement points RG of the subject eye 22a has means 17 for storing perimetry result, means 10, 24 for composing the perimetry result as a map image corresponding to a fundus and indicating it on the display 20, means 13 for obtaining and indicating a structure examination image PC1 of the subject eye 22a, means 16 for superimposing the map image MAP2 on the indicated structure examination image PC1 and indicating the superimposed as a composite image PC2, and means 15 for setting a concerned area NA on the composite image PC2, and means 21 for computing an evaluation value of the perimetry based upon the perimetry result.