Provided is a novel salt of an a-halogen-substituted thiophene compound that has powerful LPA receptor antagonistic action and that is useful as a pharmaceutical product. A salt represented by general formula (1) [In the formula: R is a hydrogen atom or a methoxy group； X is a halogen atom； A is a group selected from the group consisting of the following groups: (AA)； M is an alkali metal or an alkali earth metal； and n is 1 when M is an alkali metal, and 2 when M is an alkali earth metal].
