is a subprefecture of Hokkaido Prefecture, Japan.HistoryNovember, 1897: Kushiro Subprefecture established.August, 1922: Renamed Kushironokuni Subprefecture (釧路国支庁).October 20, 1948: Ashoro District transferred to Tokachi Subprefecture.April 1, 1957: Name returned to Kushiro Subprefecture.