To provide a method for manufacturing a dioxazine compound in a higher yield with lower probability of formation of a chlorine-containing by-product than conventional methods.

The method for manufacturing the dioxazine compound (D) comprises ring-closing in a solvent a 3,6-bisarylamino-1,4-benzoquinone compound (C) which may have one or two halogen or acylamino group substituents at 2- and 5-positions, where an imidazolidinone compound or a pyrimidinedinone compound optionally bearing an alkyl group on a nitrogen atom and/or a carbon atom is used as the solvent. Otherwise, the method for manufacturing the dioxazine compound (D) comprises effecting the ring closure using as the compound (C) a product, obtained by reacting an arylamino compound (A) with a 3,6-dihalogeno-1,4-benzoquinone compound (B) which may have one or two halogen or acylamino group substituents at 2- and 5-positions, in a solvent comprising the same compound as above without exchanging the solvent after the condensation.