Hand piece for skin treatment apparatus

A hand piece for a skin treatment apparatus, the hand piece comprising:

• a hand piece body capable of being operated by a user hand;
• a skin treatment unit connected to an end of the hand piece body, and treating a user skin;
• a pressure sensing unit installed on the skin treatment unit, and sensing a pressure between the skin and the skin treatment unit;
• and
• a pressure display unit emitting light in a plurality of colors corresponding to respective ranges of on a pressure value measured by the pressure sensing unit,
• wherein the pressure sensing unit includes a plurality of elastic assemblies change in length in response to the pressure at which the skin treatment unit presses on the skin,
• wherein the elastic assembly includes
• an upper elastic body adjacent to the skin treatment unit,
• a lower elastic body adjacent to the hand piece body, and
• an intermediate elastic body disposed between the upper elastic body and the lower elastic body, and
• wherein an elastic modulus of the intermediate elastic body is within a predetermined pressure reference range,
• an elastic modulus of the upper elastic body is below the predetermined pressure reference range, and
• an elastic modulus of the lower elastic body is above the predetermined pressure reference range.