To measure distances and displacements in a plurality of places on an object surface with a simple constitution.

A laser beam emitted from a laser light source 14 is branched to two light beams of differ directions by a splitter 15, and an optical spot is formed in each of two different positions on the surface of the object 2. A measurement processing unit 16 calculates the directions of two optical spots to a one-dimensional imaging camera 17 based on a photodetection pattern of a linear image sensor 19 of the one-dimensional imaging camera 17, and calculates the two-dimensional coordinate of the position of each of two optical spots on the surface of the object 2 by triangulation, based on the directions of the two calculated optical spots to the one-dimensional imaging camera 17, the emission directions of two light beams from the splitter 15, the position of the splitter 15, and the position of the one-dimensional imaging camera 17.