The idea of setting up a museum in the Bojnice Castle came from its last noble owner, Count Ján Pálffy. In his will dated November 14, 1907, he expressed his wish that the castle be made available to the public and that the works of art remain in their original places for visitors to see.
After the death of Jan Pálffy, his heirs did not respect his last will and contested the will in court. They sold off the valuable collection funds at auctions. Part of the collections managed to be preserved thanks to an agreement between the heirs and the government of Czechoslovakia specifying which collections are not to be the subject of auctions (these became the property of the state).
The castle became open to the general public as soon as 1907. At that time, the only guide was the castellan of the castle, later on, he was replaced by students of high schools and universities.
In 1941, the administration of Bojnice Manor allowed the members of the Upper Nitra Museum Association to place their archeological, ethnographic, ethnological and historical collections in the premises of the castle. They were stored in the premises of the Winter Garden.
A major turning point in the castle’s history was the fire that broke out on May 9, 1950. The fire damaged all the castle towers (to a different extent). Following the fire, tours of the castle premises were put on hold, and the Council of the Local National Committee in Bojnice immediately asked the competent authorities to restore the castle. The Council also proposed to establish a museum in the premises of the castle. The Council in Nitra by resolution no. 107/1950 of September 7, 1950, decided on the establishment of the Regional Museum of Local History, based in Bojnice Castle.
The first exhibition in the renovated castle premises took place on September 2, 1951. As a regionally-active institution, the museum was given the role of a methodical and advisory center for museums in the region.
The Bojnice Museum manages an extensive collection fund containing approximately 6,000 collection items.