An oral composition contains 3-{5-[4-(cyclopentyloxy)-2-hydroxybenzoyl]-2-[(3-hydroxy-1,2-benzisoxazol-6-yl)methoxy]phenyl}propionic acid or a salt thereof and polyvinylpyrrolidone is advantageous as an oral medication composition (1) which can be produced without requiring new manufacturing equipment; (2) which can be produced with simple steps; (3) which maintains stable solubility even with changes in the pH of the gastrointestinal tract and of which gastrointestinal tract absorption is improved.