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 (MS) and the reflective member , the illuminating device illuminating the irradiated object (MS) with light that has been emitted from the light-emitting element and guided to the irradiated object (MS) 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 (MS) 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 (MS) 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 (MS) and the light-emitting element , and through which light emitted from the light-emitting element to the irradiated object (MS) 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 (MS) 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 (MS) and the reflective member , the illuminating device illuminating the irradiated object (MS) with light that has been emitted from the light-emitting element and guided to the irradiated object (MS) 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 (MS) 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 (MS) 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 (MS) and the light-emitting element , and through which light emitted from the light-emitting element to the irradiated object (MS) 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 (MS) 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 . <EOS>