PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive excellent in performance for maintaining transdermal absorption promoter, adhesiveness to skin and release performance of a transdermal absorptive agent, having low irritation to skin and having no adhesive remaining on the skin during releasing from the skin when used for an adhesive sheet.SOLUTION: There is provided a pressure sensitive adhesive containing a polyurethane urea resin (A) and a reactive compound having a functional group which can react with a hydroxyl group, containing a polyol (a1) unit, a polyisocyanate (a2) unit and an amine compound (a3) unit as monomer units constituting the resin (A), the resin (A) has no aromatic ring, has an alkylene oxide unit and a hydroxyl group in a side chain, the weight average molecular weight is 10,000-500,000 and the reactive compound (B) is contained at 0.1-50 pts.wt. based on 100 pts.wt. of the resin (A).SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】 接着シートに用いた際に、経皮吸収促進剤を保持する性能、皮膚への接着性および経皮吸収性薬剤の放出性能に優れると共に、皮膚に対し低刺激性で、皮膚から剥がす際に接着剤が皮膚に残らない感圧式接着剤を提供すること。【解決手段】 ポリウレタンウレア樹脂(A)と水酸基と反応し得る官能基を有する反応性化合物(B)とを含有する感圧式接着剤であって、樹脂(A)を構成する単量体単位として、ポリオール(a1)単位、ポリイソシアネート(a2)単位及びアミン化合物(a3)単位を含有し、樹脂(A)は、芳香環を有せず、側鎖にアルキレンオキサイドユニットと水酸基とを有し、重量平均分子量が10,000~500,000であり、樹脂(A)100重量部に対して、反応性化合物(B)0.1~50重量部含まれる感圧式接着剤。【選択図】なし