To obtain a new bisazo compound exhibiting red color, blue color, etc., excellent in dyeing levelness, build-up, light fastness, reproducibility and storage stability, and useful as a reactive dyestuff, etc.

A compound of formula I [A is (fiber-nonreactive group- substituted) phenyl or naphthylene; E is (fiber-nonreactive group-substituted) hydroxynaphthalene; B is SO2-Z (Z is CH=CH2, etc.), etc.; (m) is 0,1; X is H, NHCOR18 (R18 is a lower alkyl, phenyl, etc.), etc.]. For example, a compound of formula II. The compound of formula I is obtained e.g. by diazotizing a compound of formula III and subsequently coupling the obtained diazotized compound with a compound of the formula: H-E.