14. I 1971. Ilija and Branko Cvetinović the president of the township Assembly signed the document for the foundation of the Museum.
23.11971. Ilija recorded his donation which consisted of 300 paintings of his, and twenty-five paintings and sculptures of the artists of Yugoslavia and abroad. In the name of the receiver of the gift, this record was signed by Živan Lazić, vice-president of the township Assembly of Šid.
31. V 1971. on the basis of Ilija's initiative and the document signed by the president of the township Assembly and Ilija, the township Assembly brought the^ decision of the foundation of the "Museum of naive art Ilijanum" in Šid, as an autonomous and self- managing institution in the capacity of juristic person: "Aiming at promotion and development of painting culture, systematic gathering, preserving and arranging the artistic works of Ilija Bašičević Bosilj, as well as the works of other naive painters and their presentation by the way of constant and part-time exibitions, the Museum of naive art Ilijanum is founded."
Ilijanum was solemnly opened within the celebration of the liberation of Šid on 6th of December 1970. The citizens of Šid acclaimed the foundation of Ilijanum. Unfortunately, the initial success and elation were left out of support of the township and the Province, and the Republic showed no interest in the Museum, either. Ilija and his family still continued to present the Museum Ilija's paintings and the paintings of other painters.
At the Museum there are 317 Ilija's paintings, 21 paintings of 13 ex-Yugoslav authors, and 12 paintings of 8 authors from the USA, the France, Netherlands, Germany and Poland.