The present invention relates to an external preparation for transdermal administration containing a photosensitive nonsteroidal anti-inflammatory drug and a UV blocker having high potential dermal transfer. The present invention could more surely prevent photoinduced non-immunologic or immunologic skin symptom caused by a nonsteroidal anti-inflammatory drug, in an external preparation for transdermal administration containing such a drug.本發明為關於一種外用經皮製劑,含有光感受性之非類固醇系消炎鎮痛劑及皮膚遷移性高之UV遮蔽劑。本發明可以在含有非類固醇系消炎鎮痛劑之外用經皮製劑中,確實防止該成分產生光誘導性之非免疫性或免疫性之皮膚症狀。