In 1948, after American forces returned the katana (Japanese swords) they’d confiscated during the postwar occupation, the national Ministry of Education established a society, and this museum, to preserve the feudal art of Japanese sword-making. There are dozens of swords on display here, with English explanations throughout.
The museum’s location, in a residential neighbourhood, is not obvious. Head down Kōshū-kaidō to the Park Hyatt and make a left, then the second right under the highway, followed by another quick right and left in succession. There’s a map on the website.