A metal touch sensing apparatus, comprising: a front panel formed of metal; a display window which is defined by a plurality of through holes provided in a portion of the front panel; and a touch part disposed on the front panel; a sensor printed circuit board, PCB, mounted on a position corresponding to the touch part on a rear surface of the front panel; a touch sensor mounted on the sensor printed circuit board for detecting touch of the front panel, and; a sensor housing accommodating the sensor printed circuit board; a touch booster coupled to an opened front surface of the sensor housing; an elastic member contacting a rear surface of the sensor printed circuit board to press and support the sensor printed circuit board in a direction of the touch part; and wherein a plurality of elastically deformable parts are disposed on the touch booster, each of the elastically deformable parts including: a first extension part extending from one side of an opened region of the touch booster; a second extension part extending from a position opposite to the first extension part; and a common part disposed at a central portion to connect the first extension part and the second extension part; characterized in that a protrusion protruding downward is disposed on a bottom surface of the common part; the touch sensor includes a piezoelectric type sensor; the elastic member is configured to generate a base voltage in the touch sensor in a no-touch state; and the metal touch sensing apparatus includes a sensor control part configured to detect a voltage increasing from the base voltage when a touch operation occurs to recognize that the touch operation occurs when the increasing voltage is greater than a preset value. a front panel formed of metal; a display window which is defined by a plurality of through holes provided in a portion of the front panel; and a touch part disposed on the front panel; a sensor printed circuit board, PCB, mounted on a position corresponding to the touch part on a rear surface of the front panel; a touch sensor mounted on the sensor printed circuit board for detecting touch of the front panel, and; a sensor housing accommodating the sensor printed circuit board; a touch booster coupled to an opened front surface of the sensor housing; an elastic member contacting a rear surface of the sensor printed circuit board to press and support the sensor printed circuit board in a direction of the touch part; and wherein a plurality of elastically deformable parts are disposed on the touch booster, each of the elastically deformable parts including: a first extension part extending from one side of an opened region of the touch booster; a second extension part extending from a position opposite to the first extension part; and a common part disposed at a central portion to connect the first extension part and the second extension part; characterized in that a protrusion protruding downward is disposed on a bottom surface of the common part; the touch sensor includes a piezoelectric type sensor; the elastic member is configured to generate a base voltage in the touch sensor in a no-touch state; and the metal touch sensing apparatus includes a sensor control part configured to detect a voltage increasing from the base voltage when a touch operation occurs to recognize that the touch operation occurs when the increasing voltage is greater than a preset value. a first extension part extending from one side of an opened region of the touch booster; a second extension part extending from a position opposite to the first extension part; and a common part disposed at a central portion to connect the first extension part and the second extension part; characterized in that a protrusion protruding downward is disposed on a bottom surface of the common part; the touch sensor includes a piezoelectric type sensor; the elastic member is configured to generate a base voltage in the touch sensor in a no-touch state; and the metal touch sensing apparatus includes a sensor control part configured to detect a voltage increasing from the base voltage when a touch operation occurs to recognize that the touch operation occurs when the increasing voltage is greater than a preset value.