To provide a method for producing a sulfinate salt compound useful as an intermediate for medicines and agrochemicals.

The sulfinate salt compound represented by formula (A) (wherein substituent R1 and R2 are each a hydrogen atom, 1-8C chain alkyl, 1-10C cyclic alkyl or phenyl and phenyl may contain a group or an atom selected from 1-8C chain alkyl, 1-8C alkoxy, 2-12C alkoxycarbonyl and halogen atoms as a substituent or atom; the substituent R3 is a group or atom selected from 1-8C chain alkyl, 1-8C alkoxy, 2-12C alkoxycarbonyl, phenyl and halogen atoms; when a plurality of R3s are present, each R3 may be the same or different; n is an integer of 0 or 1-4) is produced from 1, 3-benzoxathiin-4-one-1, 1-dioxide and an amine compound.