PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive and an adhesive sheet which achieve both adhesiveness to the skin and peelability from the skin at high levels and suppress an adhesive deposit in the present invention.SOLUTION: A pressure sensitive adhesive for skin patch includes an acrylic polymer which is an emulsion polymer of a monomer mixture including an acrylic acid alkyl ester (A) including an alkyl chain having 4 to 7 carbon atoms, an acrylic acid alkyl ester (B) including an alkyl chain having 8 to 12 carbon atoms, and acrylic acid. In the pressure sensitive adhesive for skin patch, the monomer mixture includes 3 to 7 mass% of acrylic acid, and a mass ratio between the acrylic acid alkyl ester (A) and the acrylic acid alkyl ester (B) is (A)/(B)=65/35 to 25/75.SELECTED DRAWING: None【課題】本発明は、皮膚に対する接着性および剥離性を高いレベルで両立し、糊残りを抑制した粘着剤および粘着シートの提供を目的とする。【解決手段】炭素数4~7のアルキル鎖を有するアクリル酸アルキルエステル(A)、炭素数8~12のアルキル鎖を有するアクリル酸アルキルエステル(B)、およびアクリル酸を含むモノマー混合物の乳化重合物であるアクリル系ポリマーを含み、前記モノマー混合物中にアクリル酸を3~7質量%含み、前記アクリル酸アルキルエステル(A)と前記アクリル酸アルキルエステル(B)との質量比が(A)/(B)=65/35~25/75である、皮膚貼付用粘着剤。【選択図】なし