The museum's founding donation in 1979

In his will of 20th May 1964, Ossip Zadkine confirmed the deed of donation entre époux (gift between spouses) in favour of his wife, Valentine Prax. He died in 1967.

In 1978, Valentine Prax made a donation of works and property to the City of Paris with a view to creating the Musée Zadkine. In a will and testament of 18th August 1979, she named the City of Paris as her general and universal legatee and bequeathed to it all of her possessions. Valentine Prax died in 1981. On 19th April 1982, the Musée Zadkine opened its doors.