To provide an apparatus for measuring surface pressure, having a wide measurement range and high applicability.

The apparatus for measuring surface pressure includes a pressure sensor matrix 10 having a plurality of plane-like regions 12 of viscosity elastic gel in which an out-surface displacement by pressure is independently generated, and an optical measurement means 20 of optically measuring the out-surface displacement of the region. Because an out-surface displacement in each region 12 of the pressure sensor matrix 10 is generated by pressure of the region, an out-surface displacement of each region 12 is measured, thereby to obtain a two-dimensional pressure distribution. This apparatus can measure a low surface pressure of kPa or below with high precision and can rapidly respond to a time change in surface pressure.