Disclosed are a needle tip mounted in a cartridge form (in a replaceable manner) to a hand piece of the skin treatment apparatus and allowing a drug to be injected deeply into an invaded potion, and a skin treatment apparatus having the needle tip mounted thereon. The needle tip includes a casing hollow in a vertical direction； a needle unit disposed in the casing and reciprocating in the vertical direction； and at least one sealing member disposed between the casing and the needle unit, wherein the needle unit includes: a housing disposed inside the casing； and at least one needle electrode disposed in the housing of the needle unit and extending in the vertical direction, wherein the at least one sealing member closes a space between the casing and the housing of the needle unit in the vertical direction.
