As for eye pressure measurement equipment 10, segregating in eyeball, 8 the probe in the probe portable mechanism it is connected 30 which adjusts the position of 20 where it can provide the searching touching element 24 where concave acoustic lens 22 and the oscillator and the vibrating detection sensor is laminated on the advanced side which faces and probe 20 vis-a-vis eyeball 8 and probe 20 and calculates eye pressure and including with the substance section 60 which, is output it is constituted. Substance section 60 with the amplifier is connected by probe 20 in series, when phase difference occurs in the input ripple mark to the oscillator and the output ripple mark from the vibrating detection sensor, frequency changing, between when the phase shift circuit and compensating phase difference to zero, the relationship of the frequency change quantity and eye pressure, compensates that phase difference to zero beforehand seeks when incidence doing the ultra wave in the eyeball, includes with the eye pressure calculation section which calculates eye pressure from the frequency change quantity which compensates the phase difference which it occurs to zero.眼圧測定装置10は、眼球8に離隔して向かい合う先端側に凹面音響レンズ22と、振動子と振動検出センサが積層される探触素子24とが設けられる探触子20と、探触子20の位置を眼球8に対して調整する探触子移動機構30と、探触子20に接続され眼圧を算出し出力する本体部60とを含んで構成される。本体部60は、探触子20に増幅器とともに直列に接続され、振動子への入力波形と振動検出センサからの出力波形に位相差が生じるときは、周波数を変化させてその位相差をゼロに補償する位相シフト回路と、位相差をゼロに補償したときの周波数変化量と眼圧との関係を予め求めておき、眼球に超音波を入射したときに生じる位相差をゼロに補償する周波数変化量から眼圧を算出する眼圧算出部とを含む。
