A sodium salt, magnesium salt, lithium salt, potassium salt, calcium salt or barium salt of (R)-2-ÄÄÄ3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinylÜmethylÜsulfiny lÜ-1H-benzimidazole, and a pharmaceutical composition comprising the salt. The novel salt is useful as an excellent antiulcer agent.