A clonidine preparation for percutaneous administration comprising a support having provided thereon an active ingredient-containing layer is disclosed. The active ingredient-containing layer contains an acrylic polymer having a glass transition temperature of from -70.degree. C. to -10.degree. C. and pressure-sensitive adhesion at room temperature as a base, at least one of clonidine and clonidine hydrochloride as an active ingredient, and a decomposition inhibitor. The active ingredient can be stably maintained within the preparation without being decomposed, and, therefore, can be effectively released over a prolonged period of time.