The castle was built in 1250 by the barons of Bechburg. It then changed hands several times. These included the Counts of Frohburg, Nidau, Thierstein, Kyburg and Buchegg. In 1415, the castle and lordship were sold to Bern and Solothurn. In 1463, the castle became the full property of Solothurn and a bailiff's seat was established. In 1635, the castle temporarily became the seat of the Bishop of Basel. In 1798, the castle lost its importance with the invasion of the French. It then served as a poorhouse, private residence, inn and finally as a quarry. In 1835, it was acquired by Johannes Riggenbach from Basel. His son Friedrich restored the castle from 1880. The heirs of Georg Wackernagel-Riggenbach sold the castle in 1975 to the honorary citizen of Oensingen, Dr. Walter Pfluger-Baumgartner, who donated it to the Neu-Bechburg Castle Foundation.


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