Career
Kuroiwa competed at the 2014 Winter Olympics for Japan. He teamed with driver Hiroshi Suzuki, Shintaro Sato and Hisashi Miyazaki in the four-man event, finishing 26th. Kuroiwa made his World Cup debut in December 2013.
As of April 2014, his best finish is 19th, in a four-man event in 2012-2013 at Lake Placid.