1. A three-dimensional image measuring device comprising: a hologram having a plurality of divided areas which are exposed to form plane images at different positions in a depth direction when a reproduced light is irradiated; a light source for irradiating the reproduced light to the hologram; shutter means disposed between the light source and the hologram for sequentially changing light transmission areas in correspondence with the plurality of divided areas of the hologram so that the reproduced light is sequentially and selectively irradiated to each one of the plurality of divided areas; an object-to-be-measured disposed in a space where the plane images are formed; light receiving means for sequentially measuring light intensities scattered upon a surface of the object-to-be measured along with change of the light transmission areas by the shutter means; and distance measuring means for measuring a distance to the object-to-be measured on the basis of an output of the light receiving means.