Antonio Mancari, 52, who owned and operated the Modern Shoe Shop, which was founded by his father in Northwest Washington in 1922, died of cardiac arrest Sunday at Sibley Memorial Hospital.

Mr. Mancari was born at the Macomb Street address where his father, a shoemaker who had immigrated to Washington from Italy, established the business. He attended Sacred Heart Academy and Gonzaga High School and while still in school began his apprenticeship as a shoemaker.

During World War II, Mr. Mancari joined the Merchant Marine and served in the North Atlantic.

He returned to Washington and worked for his father until the elder Mr. Mancari retired in the mid 1960s. The son then became manager of the shop.In 1971, he and his wife, Edwardine, expanded the business to include the sale of new shoes as well as the repair of old ones.

Mr. Mancari was a member of St. Ann's Catholic Church.

In addition to his wife, of Washington, survivors include a son, Salvatore A. of Washington, three stepchildren, Thomas Hartman of Manassas, Judy Madison of Sumerduck, Va., Nanci Buch of San Diego, Calif., and five grandchilren.

The family suggests that expressions of sympathy be in the form of contributions to the D.C. Heart Fund, 2233 Wisconsin Ave. NW Washington, D.C. 20007.