An image projection device (200, 210, 300) that project an image onto a user's retina, comprising: a light source that emits a laser beam; a control unit that generates an image light beam based on input image data, and controls emission of the image light beam from the light source; a scan unit that scans the image light beam emitted from the light source to convert the image light beam into scan light; a first light converging unit that is disposed in front of a user's eye, converges the scan light at a first convergence point in the vicinity of a pupil of the user's eye, and then irradiates the retina with the scan light to project the image on the retina; and a second light converging unit that converges the scan light scanned by the scan unit at a second convergence point in front of the first light converging unit, and then irradiates the first light converging unit with the scan light, wherein: a first optical member for making the image light beam enter the first light converging unit as diffusion light is provided at the second convergence point, in the image light beam, a ratio of an optical path length between the second light converging unit and the second convergence point to an optical path length between the scan unit and the second light converging unit is substantially the same size as a ratio of an optical path length between the second convergence point and the first light converging unit to an optical path length between the first light converging unit and the first convergence point, the first optical member has an optical characteristic which converts the image light beam into convergence light, and the image light beam is condensed in front of the first light converging unit by the first optical member, and then becomes the diffusion light to enter the first light converging unit. a light source that emits a laser beam; a control unit that generates an image light beam based on input image data, and controls emission of the image light beam from the light source; a scan unit that scans the image light beam emitted from the light source to convert the image light beam into scan light; a first light converging unit that is disposed in front of a user's eye, converges the scan light at a first convergence point in the vicinity of a pupil of the user's eye, and then irradiates the retina with the scan light to project the image on the retina; and a second light converging unit that converges the scan light scanned by the scan unit at a second convergence point in front of the first light converging unit, and then irradiates the first light converging unit with the scan light, wherein: a first optical member for making the image light beam enter the first light converging unit as diffusion light is provided at the second convergence point, in the image light beam, a ratio of an optical path length between the second light converging unit and the second convergence point to an optical path length between the scan unit and the second light converging unit is substantially the same size as a ratio of an optical path length between the second convergence point and the first light converging unit to an optical path length between the first light converging unit and the first convergence point, the first optical member has an optical characteristic which converts the image light beam into convergence light, and the image light beam is condensed in front of the first light converging unit by the first optical member, and then becomes the diffusion light to enter the first light converging unit. a first optical member for making the image light beam enter the first light converging unit as diffusion light is provided at the second convergence point, in the image light beam, a ratio of an optical path length between the second light converging unit and the second convergence point to an optical path length between the scan unit and the second light converging unit is substantially the same size as a ratio of an optical path length between the second convergence point and the first light converging unit to an optical path length between the first light converging unit and the first convergence point, the first optical member has an optical characteristic which converts the image light beam into convergence light, and the image light beam is condensed in front of the first light converging unit by the first optical member, and then becomes the diffusion light to enter the first light converging unit.