To obtain a medicine for curing chronic articular rheumatism by including an ingredient obtained from the capsular polysaccharides of bacteria belonging to the genus Klebsiella.

The medicine for curing chronic articular rheumatism contains the active polysaccharides formed by rhamnose, glucose, galactose, and glucuronic acid with the formula of →2) Rha (1→ : →2) Glc (1→ : 3) Gal (1→ : →3) GlcUA (1→ (wherein Rha is rhamunose residue; Glc is glucose residue; Gal is galactose residue; GlcUA is glucuronic acid, the numeric character adjoining an arrow expresses the position of the glycoside bond of the each residue); and a molar ratio of the respective residues is (1.4-2.2):(0.7-1.2):(0.5-1.0):(0.5-1.0).