In a holographic stereogram creating device for creating a holographic stereogram by sequentially recording interference fringes between reference light and object light, which is obtained by sequentially spatial-modulating a plurality of images picked up from different observing points, as strip or dot elemental holograms, on one hologram recording material of an object light projection optical system for irradiating the hologram recording material with the spatially modulated object light, the object light projection optical system includes a slit arranged at a conjugate position of the hologram recording material for eliminating unnecessary light and a lens attached to the slit.