PROBLEM TO BE SOLVED: To provide: novel amino-pyridine derivatives that are agonists of G protein binding receptors S1P1/EDG1 and that have a strong and persistency immunomodulating effect; and pharmaceutical compositions including the compounds.SOLUTION: Amino pyridine derivatives are shown by formula (I), wherein A denotes oxadiazole, thiadiazole or the like, and the pharmaceutical compositions include the compounds.【課題】Gタンパク質結合受容体S1P1/EDG1のアゴニストであり、強力かつ持続性の免疫抑制効果を有する新規なアミノ-ピリジン誘導体、及び該化合物を含有する医薬組成物の提供。【解決手段】式(I)[式中、Aは、オキサジアゾール、チアジアゾール等]で表されるアミノ-ピリジン誘導体、及び該化合物を含有する医薬組成物。【選択図】なし