PURPOSE: A device for measuring receive sensitivity of a communication system including a receive-only path is provided to directly connect a measurement device to an antenna installed in a communication system having receive/transmit paths and a receive-only path, to measure receive sensitivity during a general service, thereby easily perceiving an error of the system. CONSTITUTION: The first transceiver(213) of a switching unit(210) consists of the first transmitter(213a) for receiving a signal transmitted through an A-path(110), and the first receiver(213b) for receiving a signal received to a receive/transmit antenna(111). The second transceiver(215) includes the second receive measurer(215b) for receiving a signal received to a B-path(120). The first switch(212) is turned on when measuring receive sensitivity of the A-path(110), and is turned off when measuring receive sensitivity of the B-path(120). The second switch(214) operates in opposite to the first switch(212), and is turned on when measuring the receive sensitivity of the B-path(120) while being turned off when measuring the sensitivity of the A-path(110). A coupler(211) couples the transceived signals, and outputs the coupled signals to one line.