The invention provides a novel α-halogen-substituted thiophene compound salt that has a potent LPA receptor antagonistic action and is useful as a medicament.The salt is represented by the general formula (I): (wherein R is a hydrogen atom or a methoxy group; X is a halogen atom; A is selected from the group consisting of: M is an alkali metal or an alkaline earth metal; and n is 1 when M is an alkali metal and is 2 when M is an alkaline earth metal).