Max Jankner, 78, a retired store manager with Murry's Steaks Corporation and a veteran of the Jewish Legion in World War I, died Sunday at the Washington Adventist Hospital in Takoma Park after a heart attack.

Mr. Jankner was born in what was then the Austro-Hungarian Empire and came to this country at the age of 10. He lived in New York City before moving to Washington in 1941. He had lived in Silver Spring for the past 15 years.

During World War I, he fought with the Jewish Legion. This force was organized by the British to fight in Palestine against the Ottoman Empire. Mr. Jankner was a member of the Jewish War Veterans.

He joined the old Holmes Bakery in Washington as a sales driver in 1942. He worked there for 22 years before joining Murry's, where he worked until retiring in the late 1960s.

His first wife, the former Rose Shuster, to whom he was married for 42 years, died in 1968.

Mr. Jankner's survivors include his wife, the former Anne Marie Eisenberg of Silver Spring; two daughters, Bernice Tepper of West Nyack, N.Y., and Helene Bass of Silver Spring; a sister, Ruth Stern of Margate, Fla.; eight grandchildren, and two great-grandchildren.