To provide a fire sensor with an operation confirmation lamp that can be manufactured in a simple assembling process.

In this fire sensor 10 for which a printed board 40 is disposed inside a body 20, a light emitting diode 50 made into a chip for the operation confirmation lamp is mounted on the printed board 40, a light guide 60, whose one end part is brought closer to the disposed position of the light emitting diode 50 and the other end part is forcibly fitted to the open hole part of the body 20, is disposed and light of the light emitting diode 50 is led to the outside of the fire sensor 10 by the light guide 60.