A reactor 1 of the present invention includes a coil 2, a magnetic core 3 at which the coil 2 is disposed, and a case 4 storing a combined product 10 made up of the coil 2 and the magnetic core 3. The case 4 includes a bottom plate portion and a side wall portion 41A surrounding the combined product 10. The side wall portion 41A is made of an insulating resin. A hook portion 43a on which a line 71, which is coupled to a sensor 7 for measuring the physical quantity of the reactor 1, such as a temperature sensor, is hooked is integrally molded with the side wall portion 41A by the resin structuring the side wall portion 41A. Allowing the line 71 to be hooked on the hook portion 43a and fixed thereto, the sensor 7 can be prevented from being displaced or coming off because of the line 71 being pulled or the like. Thus, the sensor 7 can be maintained at a proper position.