The collection of manuscripts consists of heterogenous material varying from documents to letters and memoirs. In addition to the documents of private persons the collection contains records of various associations and written answers to many kinds of questionnaires concerning different traditions.
One part of the collection consists of letters and postcards dating from the Second World War years. The collection includes more than 25,000 letters and postcards.
The manuscript archives contain a collection of music. The archives also include a record collection, and in the Museum of Traditional Folk Instruments, Kaustinen, its instrument collection is on show.