A touch sensor assembly according to an embodiment of the present disclosure includes a sensor housing disposed at a rear surface of an external member on which a touch operation unit on which a user touches is marked, a sensor PCB accommodated in the sensor housing, and an elastic member which is disposed at a rear side of the sensor PCB and presses the sensor PCB toward a rear surface of the external member, wherein the elastic member is mounted in an elastic member accommodation portion formed at a bottom surface of the sensor housing.