[Objective] To provide a pressure-sensitive adhesive agent for skin containing a pressure-sensitive adhesive agent for skin that has favorable shape retention properties and skin-follow up properties without being adversely affected by moisture from excrement or the like even when adhered to the skin over a long period of time and yet leaves no adhesive residue after separation and a pressure-sensitive adhesive sheet for skin contains a base material and a layer of the pressure-sensitive adhesive agent for skin. [Means to Achieve Objectives] A pressure-sensitive adhesive agent for skin contains 2 to 35% by weight of a thermoplastic elastomer, 25 to 60% by weight of a hydrophilic polymer compound, 16 to 40% by weight of a softener, and 0.01 to 4.8% by weight of a physiologically active agent； and has a water absorption 3 hours after of 55 to 240% and a water absorption 24 hours after of 240 to 450%. A pressure-sensitive adhesive sheet for skin contains a base material and a layer of a pressure-sensitive adhesive agent for skin that contains 2 to 35% by weight of a thermoplastic elastomer, 25 to 60% by weight of a hydrophilic polymer compound, 16 to 40% by weight of a softener, and 0.01 to 4.8% by weight of a physiologically active agent and is formed on one side of the base material； and has a water absorption 3 hours after of 55 to 240% and a water absorption 24 hours after of 240 to 450%.[과제] 피부에 장시간 첩부한 경우에도 배설물 등으로부터의 수분에 의한 악영향을 받지 않고, 양호한 보형성과 피부 순응성을 가지며, 또한 박리시에는 풀 남음이 없는 피부용 점착제 및 기재와 상기 피부용 점착제의 층으로 되는 피부용 점착시트를 제공한다.[해결수단] 열가소성 엘라스토머 2~35 중량%, 친수성 고분자화합물 25~60 중량%, 연화제 16~40 중량% 및 생리활성제 0.01~4.8 중량%를 함유해서 되고, 3시간 후 및 24시간 후의 수 흡수율이 각각, 55~240% 및 240~450%인 피부용 점착제. 기재와, 그 편면에 형성된 열가소성 엘라스토머 2~35 중량%, 친수성 고분자화합물 25~60 중량%, 연화제 16~40 중량% 및 생리활성제 0.01~4.8 중량%를 함유해서 되는 피부용 점착제의 층으로 되고, 3시간 후 및 24시간 후의 수 흡수율이 각각, 55~240% 및 240~450%인 피부용 점착시트를 제공한다.
