To measure highly accurately face spacing of every test lens, for example, in the case of including a filter not transmitting a wave range of a light source on one side in the test lens.

This lens face spacing measuring device is equipped with a plurality of light sources 21, 22 having mutually different center wavelengths, a first bean synthesizing means 25 for synthesizing beams from the light sources, a beam splitting means 27 for splitting the synthesized beam in two directions, an optical path length variable means 30 for changing the optical path length of one split beam, a position detection means 32 for detecting the position, a light guide means 35 for guiding the other split beam to the test lens, a second bean synthesizing means 27 for synthesizing the beam whose optical path length is changed with the beam reflected by the lens face of the test lens 33, a photoelectric detector 40 for detecting an intensity signal of coherent light synthesized thereby, and an operation processing means 41 for performing operation processing of the output of the position detection means 32 and the output of the photoelectric detector 40.