An illuminating device comprising: a light-emitting element; a substrate on which the light-emitting element is mounted; a reflective member; and a light-guiding member that guides light emitted from the light-emitting element toward an irradiated object and the reflective member, the illuminating device illuminating the irradiated object with light that has been emitted from the light-emitting element and guided to the irradiated object by the light-guiding member and with light that has been emitted from the light-emitting element, guided by the light-guiding member and reflected to the irradiated object by the reflective member, wherein the light-emitting element and the reflective member are disposed to sandwich a path (St) through which light reflected by the irradiated object passes, and the light-guiding member is disposed on a side of the light-emitting element relative to the path (St), the light-guiding member includes a direct emission portion that is disposed between the irradiated object and the light-emitting element, and through which light emitted from the light-emitting element to the irradiated object is transmitted, and an indirect emission portion that is disposed between the reflective member and the light-emitting element, and through which light emitted from the light-emitting element to the irradiated object via the reflective member is transmitted, the direct emission portion and the indirect emission portion being connected to each other so as to form a single unit, characterized in that the light-guiding member covers the substrate and protrudes from an end portion of the substrate in a direction from the light-emitting element toward the reflective member, on the side of the reflective member. a light-emitting element; a substrate on which the light-emitting element is mounted; a reflective member; and a light-guiding member that guides light emitted from the light-emitting element toward an irradiated object and the reflective member, the illuminating device illuminating the irradiated object with light that has been emitted from the light-emitting element and guided to the irradiated object by the light-guiding member and with light that has been emitted from the light-emitting element, guided by the light-guiding member and reflected to the irradiated object by the reflective member, wherein the light-emitting element and the reflective member are disposed to sandwich a path (St) through which light reflected by the irradiated object passes, and the light-guiding member is disposed on a side of the light-emitting element relative to the path (St), the light-guiding member includes a direct emission portion that is disposed between the irradiated object and the light-emitting element, and through which light emitted from the light-emitting element to the irradiated object is transmitted, and an indirect emission portion that is disposed between the reflective member and the light-emitting element, and through which light emitted from the light-emitting element to the irradiated object via the reflective member is transmitted, the direct emission portion and the indirect emission portion being connected to each other so as to form a single unit, characterized in that the light-guiding member covers the substrate and protrudes from an end portion of the substrate in a direction from the light-emitting element toward the reflective member, on the side of the reflective member.