An anion exchange membrane comprising a resin phase which contains from 20 to 96 mass % of a polymer having repeating units represented by the following formula (1): ##STR00001## wherein A is a C.sub.3-8 alkylene group or an alkyleneoxyalkyl group having a total carbon number of from 4 to 9, each of R.sup.1, R.sup.2 and R.sup.3 is a hydrogen atom, a C.sub.1-6 alkyl group or a hydroxyalkyl group, and X.sup.- is an anion, and wherein any hydrogen atom bonded to the benzene ring may be substituted by an alkyl group or a halogen atom, and from 4 to 80 mass % of a thermoplastic polymer having no ion exchange groups, substantially uniformly.