Governor K Sankaranarayanan administered the oath of office to Jadhav, who replaces Water Resources Minister Sunil Tatkare who has quit after being appointed the chief of the state NCP unit.
Jadhav is a former state minister, who was dropped a year ago and named state NCP chief. He was holding the post since June 14, 2013.
Both Jadhav and Tatkare hail from coastal Konkan.
At the recent extended working committee meeting of the party, Jadhav had proposed Tatkare's name for the post of state unit chief.