To provide an optical distance-measuring device which can be miniaturized and by which a distance can be measured with high accuracy and in a wide range by effectively making use of a characteristic that a hologram lens can be endowed with an angle-dependent property and with a radiation-angle amplifying property.

A hologram lens 70 is fitted to, and mounted on, the opening part of a casing 31 in a light-receiving system R. A semiconductor position sensor (PSD) 40 is constituted in such a way that it is fixed in parallel with both an optical axis I1 and an optical axis R1 between a light-projecting system I and a light-receiving system R inside the casing 31. The hologram lens 70 is formed in such a way that the radiation angle of light from the hologram lens 70 becomes larger than the angle of incidence of light on the hologram lens 70.