A non-contact type tonometer for measuring intraccular pressure of human eye. The tonometer includes a fluid ejection nozzle to eject a fluid toward a cornea of an eye to be tested and an alignment control apparatus. The alignment control apparatus comprises a pair of alignment optional system disposed in such a manner as to intersect the respective optical axes at one point on the axial line of the fluid ejection nozzle and in symmetrical positions with respect to each other, with the axial line of symmetry. The alignment optical system each includes an index projection optical system for projecting an index spot light which is in condition in parallel light rays toward the cornea and an index detection system for forming vertical image of the index spot light produced by means of the corneal specular reflection of the eye on an observation system as an index image through a part of an index projection optical system of the other alignment optical system. Whereby an alignment control between the eye to be tested and the fluid ejection nozzle is made by means of confirming a superposed relation of the pair of index image formed on the observation system.
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