A tonometer for measuring intraocular pressure of an examinees eye in a non-contact manner, comprises: an arithmetic part (20) for calculating the intraocular pressure a fluid blowing unit (1-7, 9) for blowing a fluid at a cornea of the examinees eye through a nozzle (6) a projecting optical system (90a) for projecting light onto an anterior segment of the examinees eye through the nozzle, the system including a light source (91) and a condensing lens (34, 47, 92) and an imaging optical system (90b) for imaging a cross-sectional image of the anterior segment, the system including an imaging lens (96) and an imaging element (97). The imaging optical system is placed so that extended planes of a cross section of the light projected onto the anterior segment by the projecting optical system, a principal plane of the imaging lens, and an imaging plane of the imaging element intersect one another on one axis, and the projecting optical system includes a light restriction unit (7) that allows the light from the light source to pass through inside of the nozzle but not to pass through outside of the nozzle.
