PURPOSE: An adhesive is provided to have excellent cohesiveness, to not cause curtaining at separation from skin, and to have excellent stability. CONSTITUTION: An adhesive comprises a support, a pressure-sensitive adhesive layer provided to one surface of the support. The pressure-sensitive adhesive layer contains an acrylic copolymer. The acrylic copolymer is obtained by copolymerizing a monomer mixture containing (meth)acrylic acid alkyl ester, a hydroxy group-containing monomer, and a diketone group-containing monomer. The pressure adhesive layer is obtained by copolymerizing a monomer mixture containing 7.5-20 weight% of a hydroxyl-group containing monomer.본 발명의 일 실시양태에 따른 부착제는 지지체, 및 상기 지지체의 적어도 한 표면 상에 제공된 감압 접착제층을 포함한다. 감압 접착제층은 (a) (메트)아크릴산 알킬 에스테르, (b) 히드록실기-함유 단량체 및 (c) 디케톤기-함유 단량체를 함유하는 단량체 혼합물을 공중합함으로써 얻어진 아크릴 공중합체를 함유한다.
