SMOKE SENSOR

To provide a smoke sensor capable of detecting a fire in which no smoke is generated, without using a sensor for heat detection.SOLUTION: In a smoke sensor comprising a light-emitting element which emits light toward a smoke detection section and a light-receiving element which receives the light of the light-emitting element scattered by an inflow substance flowing into the smoke detection section, provided are a first wall part, a second wall part, and a support member which directly or indirectly supports the second wall part. The first wall part is provided at a position where light from the light-emitting element is reflected and incident to the light-receiving element in a case where there is no second wall part. The second wall part is configured to reflect light from the light-emitting element in a direction other than toward the light-receiving element by blocking the space between the light-emitting element and the first wall part or absorb light from the light-emitting element by blocking the space between the light-emitting element and the first wall part. The second wall part or the support member is composed of a material which is at least partially deformed or molten by heat from a fire.SELECTED DRAWING: Figure 4 【課題】熱検知用のセンサを用いることなく、煙が発生しない火災を検知することのできる煙感知器を提供する。【解決手段】検煙部に向かって発光する発光素子と、検煙部に流入した流入物によって散乱した発光素子の光を受光する受光素子と、を有する煙感知器において、第１壁部と、第２壁部と、第２壁部を直接的又は間接的に支持する支持部材と、を備え、第１壁部は、第２壁部がない場合に、発光素子からの光を反射させて受光素子に入射させる位置に設けられており、第２壁部は、発光素子と第１壁部との間を遮って発光素子からの光を受光素子以外の方向に反射させる、又は発光素子と第１壁部との間を遮って発光素子からの光を吸収するものであり、第２壁部又は支持部材は、火災による熱により少なくとも一部が変形又は溶融する材料で構成されている。【選択図】図４