Abstract: A handpiece of a skin care device is disclosed. The handpiece includes a body part having an attaching and detaching hole provided on one side thereof, a solution introducing part linked with the attaching and detaching hole, an air discharging part, and a disposable tip module mounted onto the attaching and detaching hole of the body part. The tip module includes a cylinder body detachably mounted onto the attaching and detaching hole, and an inner cylinder configured to have a hollow inside and installed in the cylinder body. The hollow inside of the inner cylinder is linked with the solution introducing part and is configured as a solution injection flow channel in which a solution introduced from the solution introducing part flows when the tip module is mounted onto the attaching and detaching hole.