An illumination apparatus using a coherent light source, comprising: a coherent light source that generates a coherent light beam; a hologram recording medium (45. 46, 85) on which an image of a scatter plate is recorded; and a light beam scanning device (60, 65) that irradiates the light beam (L60, L65) onto the hologram recording medium (45, 46, 85), and scans the light beam (L60. L65) so that an irradiation position of the light beam (L60, L65) on the hologram recording medium (45, 46, 85) changes with time, wherein the image of the scatter plate was recorded as a hologram on the hologram recording medium (45, 46, 85) by using reference light (L23, Lref) irradiated along an optical path, the coherent light source generates a light beam with a wavelength capable of reproducing the image of the scatter plate, the light beam scanning device (60, 65) scans the light beam (L60, L65) so that an irradiation direction of the light beam (L60, L65) with respect to the hologram recording medium (45, 46, 85) is along the optical path of the reference light (L23, Lref), and reproduction light of the image of the scatter plate obtained from the hologram recording medium (45, 46, 85) is used as illumination light, characterized in that the light beam scanning device bends the light beam at a scanning origin, irradiates the bent light beam onto the hologram recording medium, and scans an irradiation position of the bent light beam on the hologram recording medium with time by changing a bending mode of the light beam with time, the image of the scatter plate was recorded as a hologram on the hologram recording medium by using reference light that converges on a specific convergence point or reference light that diverges from a specific convergence point, and the light beam scanning device scans the light beam by setting the convergence point as the scanning origin. a coherent light source that generates a coherent light beam; a hologram recording medium (45. 46, 85) on which an image of a scatter plate is recorded; and a light beam scanning device (60, 65) that irradiates the light beam (L60, L65) onto the hologram recording medium (45, 46, 85), and scans the light beam (L60. L65) so that an irradiation position of the light beam (L60, L65) on the hologram recording medium (45, 46, 85) changes with time, wherein the image of the scatter plate was recorded as a hologram on the hologram recording medium (45, 46, 85) by using reference light (L23, Lref) irradiated along an optical path, the coherent light source generates a light beam with a wavelength capable of reproducing the image of the scatter plate, the light beam scanning device (60, 65) scans the light beam (L60, L65) so that an irradiation direction of the light beam (L60, L65) with respect to the hologram recording medium (45, 46, 85) is along the optical path of the reference light (L23, Lref), and reproduction light of the image of the scatter plate obtained from the hologram recording medium (45, 46, 85) is used as illumination light, characterized in that the light beam scanning device bends the light beam at a scanning origin, irradiates the bent light beam onto the hologram recording medium, and scans an irradiation position of the bent light beam on the hologram recording medium with time by changing a bending mode of the light beam with time, the image of the scatter plate was recorded as a hologram on the hologram recording medium by using reference light that converges on a specific convergence point or reference light that diverges from a specific convergence point, and the light beam scanning device scans the light beam by setting the convergence point as the scanning origin.