The drummer, who formed the group with singer Ricky Wilson and guitarist Andrew White, announced his decision on his Twitter.com page on Tuesday (04Dec12).
He writes, "I can confirm I have left Kaiser Chiefs after 15 spectacular years. I'm moving on. I wish the rest of the band the very best!"
His bandmates also took to the social networking site to send messages of support, with bassist Simon Rix tweeting, "Good luck to Nick with his plans. I can exclusively confirm we will still be collaborating on pints in pubs."
Wilson adds, "The door is on the latch and the key under the mat."