An illumination fixture comprising: a light-emitting part having a light-emitting element; a sensor part having an infrared sensor element; a lighting device having control means adapted to light and light off the light-emitting part by controlling power to be supplied to the light-emitting part based on an output from the sensor part; and a fixture main body that holds the light-emitting part and the sensor part, wherein: a barrier wall that lets visible light emitted from the light-emitting part pass and interrupts an infrared ray radiated from the light-emitting part toward the sensor part is disposed between the light-emitting part and the sensor part, wherein: the illumination fixture comprises a first base substrate formed in a plate shape and having a through hole penetrating through a center portion and a second base substrate formed in a plate shape and having an outer shape formed smaller than the through hole and disposed inside the through hole; the light-emitting part is mounted on the first base substrate and the sensor part is mounted on the second base substrate; the barrier wall is formed of a material that lets the visible light emitted from the light-emitting part pass and interrupts the infrared ray radiated from the light-emitting part toward the sensor part and has a plurality of first leg pieces (43b1) and a plurality of second leg pieces (43b2) extending from an end face of the barrier wall on a first base substrate side and an end face on a second base substrate side to the first base substrate side and the second base substrate side; each of the first leg pieces has a tip portion formed with a first nail piece (43c1) protruding to a side facing an inner perimeter portion of the through hole of the first base substrate; each of the second leg pieces has a tip portion formed with a second nail piece (43c2) protruding to a side facing an outer perimeter portion of the second base substrate; and with each of the first leg pieces and each of the second leg pieces being inserted in a space between the first base substrate and the second base substrate to engage the first nail pieces in a perimeter portion of the through hole of the first base substrate and engage the second nail pieces in the outer perimeter portion of the second base substrate, the barrier wall is mounted on the first base substrate and holds the second base substrate, the barrier wall being formed in a shape to have a height from the surface of the base substrate so as not to interfere with a sensing area of the sensor part. a light-emitting part having a light-emitting element; a sensor part having an infrared sensor element; a lighting device having control means adapted to light and light off the light-emitting part by controlling power to be supplied to the light-emitting part based on an output from the sensor part; and a fixture main body that holds the light-emitting part and the sensor part, wherein: a barrier wall that lets visible light emitted from the light-emitting part pass and interrupts an infrared ray radiated from the light-emitting part toward the sensor part is disposed between the light-emitting part and the sensor part, a barrier wall that lets visible light emitted from the light-emitting part pass and interrupts an infrared ray radiated from the light-emitting part toward the sensor part is disposed between the light-emitting part and the sensor part, the illumination fixture comprises a first base substrate formed in a plate shape and having a through hole penetrating through a center portion and a second base substrate formed in a plate shape and having an outer shape formed smaller than the through hole and disposed inside the through hole; the light-emitting part is mounted on the first base substrate and the sensor part is mounted on the second base substrate; the barrier wall is formed of a material that lets the visible light emitted from the light-emitting part pass and interrupts the infrared ray radiated from the light-emitting part toward the sensor part and has a plurality of first leg pieces (43b1) and a plurality of second leg pieces (43b2) extending from an end face of the barrier wall on a first base substrate side and an end face on a second base substrate side to the first base substrate side and the second base substrate side; each of the first leg pieces has a tip portion formed with a first nail piece (43c1) protruding to a side facing an inner perimeter portion of the through hole of the first base substrate; each of the second leg pieces has a tip portion formed with a second nail piece (43c2) protruding to a side facing an outer perimeter portion of the second base substrate; and with each of the first leg pieces and each of the second leg pieces being inserted in a space between the first base substrate and the second base substrate to engage the first nail pieces in a perimeter portion of the through hole of the first base substrate and engage the second nail pieces in the outer perimeter portion of the second base substrate, the barrier wall is mounted on the first base substrate and holds the second base substrate,