PROBLEM TO BE SOLVED: To quickly and accurately align a measurement optical system with the vertex of the cornea of a subjects eye.SOLUTION: Provided is a non-contact tonometer S, comprising: an apparatus main body 4 for irradiating a subjects eye E with infrared light and detecting the infrared light from the subjects eye a support portion 1 for supporting a position of a face HB of the subject and a driving unit 50 for relatively moving the apparatus main body and the support portion. The tonometer is characterized in that the apparatus main body and the support portion are moved relatively to align the apparatus main body with the subjects eye in the XY direction and adjust the apparatus main body in distance with the subjects eye in the Z direction. First alignment is performed in which the subjects eye is irradiated with infrared light such that the cornea of the subjects eye is photographed in more than two different directions substantially at the same time to detect Purkinje images of the subjects eye for alignment of the apparatus main body with the subjects eye. Second alignment is performed in which the apparatus main body is adjusted in distance with the subjects eye, on the basis of the vertex position of the cornea of the subjects eye where scattered images of the cornea are produced by visible light projected onto the subjects eye.SELECTED DRAWING: Figure 1【課題】被検眼の角膜の頂点に測定光学系を迅速かつ正確にアライメントする。【解決手段】被検眼Eに赤外光を照射すると共に被検眼からの前記赤外光を検出する装置本体4と、被験者の顔HBの位置を支持する支持部1と、装置本体と支持部とを相対的に移動させる駆動部50と、を備える非接触式眼圧計Sにおいて、装置本体と支持部とを相対的に移動させて装置本体を前記被検眼とのXY方向の位置合わせ、及び被検眼とのZ方向の距離合わせを行う。被検眼に赤外線を照射して被検眼の角膜を2以上の異なる方向から実質的に同時に撮影して被検眼におけるプルキンエ像を検出して装置本体を被検眼に対して位置合わせする第1アライメントと、被検眼に照射した可視光の角膜による散乱像を検出した被検眼の角膜の頂点位置に基づいて装置本体を被検眼との距離合わせをする第2アライメントとを行う。【選択図】図1
