Kumar garlanded a statute of the freedom fighter Jayprakash Narayan at Gandhi Maidan.
Bihar Governor Ramnath Kovind also paid respect to the Loknayak popularly called 'JP'.
The chief minister and governor recalled the leader's principles.
Kumar is a disciple of JP and had played a prominent role in 'Sampoorna Kranti' in 1974.
Jayprakash Narayan had asked the people of Bihar to observe the day on June 5 and then form a 'janata sarkar' in every village to usher in a new social order.