A receiver unit (63) includes: a receiving section (63a) receiving a signal of a measurement value (Tm2) transmitted from a wireless temperature sensor unit (13); an input connector (63d) connected to a sensor signal line (62), the sensor signal line (62) being configured to transfer a signal of a measurement value (Tm1) of the suction air temperature sensor (61); a signal generator (63c) generating a signal serving as an index of indoor temperature, based on the measurement values (Tm1, Tm2) of the wireless temperature sensor unit (13) and the suction air temperature sensor (61); and a signal output section (63e, 64) outputting the signal generated by the signal generator (63c) to a controller (28, 66) of an air-conditioning device (10).