A light emitting portion for a photoelectric smoke sensor adapted to direct inspection light into a detection region of the photoelectric smoke sensor, the light emitting portion comprising: a light emitting element adapted to output the inspection light with high brightness whose brightness distribution is adjusted; a reflection portion provided on the light emission side of the light emitting element and adapted to direct the inspection light from the light emitting element to the detection region; a diaphragm portion provided on the light emission side of the reflection portion and adapted to transmit the inspection light traveling toward the detection region and to remove light diffused to regions other than the detection region; and a light shielding portion provided on the light emission side of the diaphragm portion and adapted to shield the light diffused to the regions other than the detection region, wherein the light emitting element is provided with a light source adapted to output the inspection light with high brightness and a parabola reflective mirror whose curved surface is set so that light from the light source is reflected and becomes the inspection light toward the detection region; and the light source and the curved surface of the parabola reflective mirror are set such that, if the inspection light irradiates a plane disposed on the optical axis extending to the detection region on the light emission side of the parabola reflecting mirror and at a position opposite to this parabola reflecting mirror, the light is emitted in a circular shape as a whole and also emitted in a doughnut shape in which the center of the circle is relatively dark and the periphery is bright, the reflection portion has a conical reflecting surface expanding towards the light emission side; and an inclination angle of the conical reflecting surface is set to an angle at which the inspection light corresponding to the bright doughnut-shaped periphery portion is directed into the detection region. a light emitting element adapted to output the inspection light with high brightness whose brightness distribution is adjusted; a reflection portion provided on the light emission side of the light emitting element and adapted to direct the inspection light from the light emitting element to the detection region; a diaphragm portion provided on the light emission side of the reflection portion and adapted to transmit the inspection light traveling toward the detection region and to remove light diffused to regions other than the detection region; and a light shielding portion provided on the light emission side of the diaphragm portion and adapted to shield the light diffused to the regions other than the detection region, wherein the light emitting element is provided with a light source adapted to output the inspection light with high brightness and a parabola reflective mirror whose curved surface is set so that light from the light source is reflected and becomes the inspection light toward the detection region; and the light source and the curved surface of the parabola reflective mirror are set such that, if the inspection light irradiates a plane disposed on the optical axis extending to the detection region on the light emission side of the parabola reflecting mirror and at a position opposite to this parabola reflecting mirror, the light is emitted in a circular shape as a whole and also emitted in a doughnut shape in which the center of the circle is relatively dark and the periphery is bright, the reflection portion has a conical reflecting surface expanding towards the light emission side; and an inclination angle of the conical reflecting surface is set to an angle at which the inspection light corresponding to the bright doughnut-shaped periphery portion is directed into the detection region.