The local museum is set up in two trading houses from the 18th century, which, by themselves, already have a museum-like character. House No. 14 belongs to the type of residential warehouse. The ground floor housed the business premises, and the living quarters were on the first floor. The attic and cellar served as storage spaces. Horses and carriages were housed in the back buildings. The focus is on residential culture. The extensive collection includes cabinets, chests, alcoves, seating furniture, clocks, household items made of pewter, copper, and brass, tableware, and tiles. A small "Krüdeneerswinkel" from 1782 complements the collection. The prehistorical department displays discoveries from the first settlement phase on the Geest (Stone Age, Bronze Age, early Iron Age) and from the second settlement phase (Roman Empire period). Highlights of the maritime department include 20 ship models, as well as the bow and stern of the last original inland tjalk of East Frisia. In the local history department, the following topics are represented: Leer during the Migration Period, Liudger and the construction of the first church, monastery foundations around Leer, the chieftain Focko Ukena, Fortress Leerort, Plytenberg, the foundation and development of the Gallimarkt, the linen weaving industry in Leer, and Leer after it was granted city rights in 1823.