The club was founded on October 23, 2000, under the name Handball Association "Mladi Rudar" (youth team), as a handball organization for the education and development of young handball players for the needs of the MRK Rudar Labin, which in the 2000/01 season competed in the 1st A HRL.
However, "Rudar" got into financial problems, and they were called "RK Istra" for a short time.
Mladi Rudar took over "Rudar's" younger players and part of the remaining seniors, forming the senior team with which it played in the 2001/02 season, in the 3rd HRL - West 2, which the club won, entering the 2nd HRL - West, in which he played until the 2009/10 season, when it entered the 1st HRL, where the club played for the 2010/11 and 2011/12 seasons, whereafter it was again relegated to the 2nd HRL - West, where it played until the 2015/16 season, when it entered the 1st HRL - South, which was won by the club in the 2017/18 season, becoming a member of the Premier League.
The Croatian league is considered the 8th top handball championship in the world.
[2][3] The club has a reserve (B) team, that competes in the 3rd HRL - West.