PURPOSE: To provide the titled composition soluble rapidly in water without causing the clouding of the solution, miscible with pefumery without emitting ill odor, and utilizable as a component of detergent, deodorizer, bath liquid, etc. for home use, by coating the surface of fumaric acid with a specific water-soluble polymeric compound.

CONSTITUTION: Fumaric acid is coated with a water-soluble polymeric compound consisting of the homopolymer or copolymer of the monomer of formula I (R1 and R2 are H or COOX2 provided that both R1 and R2 are not COOX2 at the same time; R3 is H or methyl; X1 and X2 are alkali metal) and/or formula II(A1 is H or methyl; A2 is acid ester group of COOY; Y is 1W8C alkyl or 2W5C monohydroxyalkyl). The composition is preferably incorporated further with a condensed phosphoric acid salt (e.g. sodium tripolyphosphate) to prevent the generation of ill odor and stabilize the perfumery. The amount of the salt is 0.01W 2wt% in terms of phosphorus based on the fumaric acid composition.