PURPOSE: To measure an intraocular pressure value by eliminating influence on optically detected output by the difference in reflected light quantity generated from the cornea of an eye to be inspected.

CONSTITUTION: Reflected light from an anterior eye part by a light source 13 is image-formed on a video camera 8, and the anterior eye image Pf is displayed on a television monitor 19. The reflected light from the cornea Ec irradiated by the light source 10 is similarly image-formed on the television camera 8, and is displayed on the television monitor 19 as a light source image 10a. When alignment is completed by unifying those images, a rotary solenoid 17 is driven, and the air in a compression chamber 14 is compressed, and the cornea Ec is deformed by spraying the air on the cornea Ec from a nozzle 1. When the cornea Ec is deformed to a prescribed shape, the output of a light receiving sensor 12 is maximized, and it is transmitted to an MPU 22 via a nonlinear amplifier circuit 23, and the internal pressure of the compression chamber 14 is detected by a pressure sensor 18, then, it is converted to the intraocular pressure value.