The present invention provides a novel crystalline form of n-butyl[4-[2-[2-hydroxy-5-(N-hydroxycarbamimidoyl) benzenesulfonylamino]ethyl]-2'-methanesulfonyl-3-yloxy] acetate hydrochloride, pharmaceutical compositions containing the same and their uses, which exhibits excellent inhibitory activities against activated blood coagulation factor X, and is useful for the treatment or prevention of a tromboembolic disease.