Photoelectric type five detector and adjustment unit thereto

A photoelectric fire detector capable of accurately adjusting the sensitivity by using a scattering and translucent plate and exhibiting excellent reliability is provided, the photoelectric fire detector having a first detection unit and a fourth detection unit for respectively detecting a first received output and a fourth received output from the smoke detection portion realized when the light emitting device emits light in a case where the scattering and translucent plate is not inserted and as well as no smoke is present, a second detection unit and a third detection unit for respectively detecting a second received output and a third received output from the smoke detection portion realized when the light emitting device emits light in a case where the scattering and translucent plate is inserted and as well as no smoke is present, and a calculating unit for calculating the physical quantity of smoke with respect to a received output from the smoke detection portion realized when the light emitting device emits light in a state where a fire is supervised based on the first to fourth received outputs and a smoke density of the scattering and translucent plate realized when the second and third received output have been obtained.