List of National Treasures of Japan (crafts: swords)
Prefecture City National Treasures
Aichi Nagoya 8
Ehime Imabari 3
Fukuoka Dazaifu 1
Fukuoka Fukuoka 2
Fukuoka Yanagawa 1
Gifu Takayama 1
Hiroshima Hatsukaichi 2
Hiroshima Private 5
Hyōgo Nishinomiya 2
Ibaraki Kashima 1
Ibaraki Tsuchiura 1
Ishikawa Kanazawa 1
Kagoshima Kagoshima 1
Kanagawa Kamakura 1
Kōchi Hidaka 1
Kyoto Kyoto 3
Nara Nara 6
Okayama Okayama 3
Okayama Private 1
Osaka Osaka 3
Statistics
The term National Treasure has been used in Japan to denote cultural properties since 1897,
although the definition and the criteria have changed since the introduction of the term. The swords and sword mountings in the list adhere to the current definition, and have been designated national treasures according to the Law for the Protection of Cultural Properties that came into effect on June 9, 1951. The items are selected by the Ministry of Education, Culture, Sports, Science and Technology based on their especially high historical or artistic value. The list presents 110 swords and 12 sword mountings from ancient to feudal Japan, spanning from the late Kofun to the Muromachi period. The objects are 
housed in Buddhist temples, Shinto shrines, museums or held privately. The Tokyo National Museum houses the largest number of these national treasures, with 20 of the 122. During the Yayoi period from about 300 BC to 300 AD, iron tools and weapons such as knives, axes, swords or spears, were introduced to Japan from China via the Korean peninsula. Shortly after this event, Chinese, Korean, and eventually Japanese swordsmiths produced ironwork locally. Swords were forged to imitate Chinese blades: generally straight chokutō with faulty tempering. Worn slung from the waist, they were likely used as stabbing and slashing weapons. Although functionally it would generally be more accurate to define them as hacking rather than slashing weapons. Swordmaking centers developed in Yamato, San'in and Mutsu where various types of blades such as tsurugi, tōsu and tachi were produced.