PROBLEM TO BE SOLVED: To provide a therapeutic agent for HTLV-I-associated diseases such as HTLV-I-associated myelopathy and uveitides.SOLUTION: There is provided a pharmaceutical agent for HTLV-I-associated diseases such as HTLV-I-associated myelopathy and uveitides, comprising, as an active ingredient, an RAR agonist represented by formula (I) [wherein Rto Rindependently represent a hydrogen atom, an alkyl group, or an alkyl-substituted silyl group； X represents -CO-NH-, -NH-CO- or -CO-CH=CH-； and A represents a carboxylate-substituted aromatic group or a tropolonyl group].【課題】HTLV-I関連脊髄症又はぶどう膜炎などのHTLV-I関連疾患の治療薬を提供する。【解決手段】HTLV-I関連脊髄症又はぶどう膜炎などのHTLV-I関連疾患の治療薬であって、式(I)〔R1～R5は水素原子、アルキル基、又はアルキル置換シリル基、Xは-CO-NH-、-NH-CO-、又は-CO-CH=CH-、Aはカルボン酸置換芳香族基又はトロポロニル基〕で表されるRARアゴニストを有効成分として含む医薬：【選択図】なし
