The Museum School of Eskoriatza was created around 1986, in amenities within the Town Hall, as a project to complement the teaching of history in Luis Ezeiza School. At a later date, the Council bought Ibarraundi mansion and in 2005 the Museum School of Eskoriatza became the Ibarraundi Museum.
It is believed that Ibarraundi mansion dates from the middle of the 15th century, that is, from the late Middle Ages, and that it belonged to the Galartza family. Although it was initially a mansion or tower house, it was used as a farm house between the 18th and 21st centuries.
Nowadays, in addition to protecting, studying and promoting the historical and ethnological heritage of Eskoriatza, the museum seeks to be a centre for the cultural expression and research of the town and the Leniz valley.