The present invention provides a novel benzazepine derivative represented by formula: ##STR00001## wherein, R.sup.1 is a 5- or 6-membered aromatic ring, R.sup.2 is lower alkyl group, etc., Y is an optionally substituted imino group, ring A and ring B are independently an optionally substituted aromatic ring, W is formula --W.sup.1--X.sup.2--W.sup.2-- (W.sup.1 and W.sup.2 are independently S(O).sub.m1 (m1 is 0, 1, or 2), etc., and X.sup.2 is an optionally substituted alkylene group etc.), a preparation method and use thereof.