Indiana House minority leader Scott Pelath says he's giving up that post and won't seek re-election next year.
He said Sunday that his last day as House Democratic leader will be on Organization Day on Tuesday. He says he'll finish out the remainder of his term.
Pelath, of Michigan City, was first elected to the House in 1998.
Pelath ascended to House leadership in 2012 after Democrats ousted former leader Pat Bauer.
The House Democrat caucus will meet Tuesday to elect a new leader.
In a letter emailed Sunday to House Democrats, Pelath said his decision was based in part on a desire to spend more time with his family. His wife, Laura, recently had a baby boy, the couple's fourth child.
Pelath works as a human resources director at the Michigan City-based Swanson Center, a mental health and addiction services agency.
Brandon Smith contributed to this story.