A touch sensor assembly comprising: a sensor housing positioned at a rear surface of an exterior member in which a touch input region is marked on a front surface; a sensor printed circuit board, PCB, provided in the sensor housing, the sensor PCB including a first surface facing the rear surface of the exterior member and a second surface opposite the first surface; a touch sensor mounted on the first surface and configured to sense a touch input at the touch input region; an elastic member pressed against the second surface of the sensor PCB and pushing the touch sensor toward the rear surface of the exterior member; and an accommodation recess formed in an inner surface of the sensor housing and providing an installation position of the elastic member, wherein the elastic member includes: an extension pressed against a bottom of the accommodation recess; and a pair of support legs extending from both ends of the extension, wherein ends of the pair of support legs are pressed against a rear surface of the sensor PCB at an outside of an outer edge of the touch sensor, and are formed to support the sensor PCB, wherein the sensor housing includes: a housing body on which the sensor PCB is mounted; and a housing cover coupled the housing body and pressed against the rear surface of the exterior member, wherein the sensor housing further includes: a pair of installation guides configured to protrude from the inner surface of the housing body and extending in a first direction; and a plurality of fixing ribs configured to protrude from the inner surface of the housing body and extending in a second direction perpendicular to the first direction, characterised in that the accommodation recess is defined by a pair of fixing ribs intersecting the pair of installation guides. a sensor housing positioned at a rear surface of an exterior member in which a touch input region is marked on a front surface; a sensor printed circuit board, PCB, provided in the sensor housing, the sensor PCB including a first surface facing the rear surface of the exterior member and a second surface opposite the first surface; a touch sensor mounted on the first surface and configured to sense a touch input at the touch input region; an elastic member pressed against the second surface of the sensor PCB and pushing the touch sensor toward the rear surface of the exterior member; and an accommodation recess formed in an inner surface of the sensor housing and providing an installation position of the elastic member, wherein the elastic member includes: an extension pressed against a bottom of the accommodation recess; and a pair of support legs extending from both ends of the extension, wherein ends of the pair of support legs are pressed against a rear surface of the sensor PCB at an outside of an outer edge of the touch sensor, and are formed to support the sensor PCB, an extension pressed against a bottom of the accommodation recess; and a pair of support legs extending from both ends of the extension, wherein ends of the pair of support legs are pressed against a rear surface of the sensor PCB at an outside of an outer edge of the touch sensor, and are formed to support the sensor PCB, wherein the sensor housing includes: a housing body on which the sensor PCB is mounted; and a housing cover coupled the housing body and pressed against the rear surface of the exterior member, a housing body on which the sensor PCB is mounted; and a housing cover coupled the housing body and pressed against the rear surface of the exterior member, wherein the sensor housing further includes: a pair of installation guides configured to protrude from the inner surface of the housing body and extending in a first direction; and a plurality of fixing ribs configured to protrude from the inner surface of the housing body and extending in a second direction perpendicular to the first direction, characterised in that the accommodation recess is defined by a pair of fixing ribs intersecting the pair of installation guides. a pair of installation guides configured to protrude from the inner surface of the housing body and extending in a first direction; and a plurality of fixing ribs configured to protrude from the inner surface of the housing body and extending in a second direction perpendicular to the first direction, characterised in that the accommodation recess is defined by a pair of fixing ribs intersecting the pair of installation guides.