This is considered the first museum of naive art in the world. The museum keeps works of Croatian naive expression of the 20th century. It is located in the 18th century Raffay Palace in the Upper Town.
The museum holdings consist of 1500 works of art - paintings, sculptures, drawings and prints, mainly by Croatian but also by other well-known world artists. There are also large documentary holdings about the Naive. The permanent exhibition was created according to a dual motif: "Naive art as a segment of modern art" and "They created the history of Croatian naive art". Some 80 anthology piece paintings and sculptures of some score of classics of the Naive are on show (Ivan Generalic, Mirko Virius, Ivan Vecenaj, M. Kovacic, Ivan Lackovic, Ivan Rabuzin). As well as these, works by artists of world significance are on show (G. van der Steen, S. Schwartzenberg, E. Benassi, E. Bodeker). From time to time, the museum organizes topics and retrospective exhibitions by naive artists, expert meetings and educational workshops and playrooms.