Ramashray Rai of Congress defeated Ram Lakhan Singh of Janata Party (SC) in 1980.

In the 2010 state assembly elections, Manju Hajari of BJP won the Rosera seat defeating her nearest rival Pitamber Paswan of RJD.

In the 2015 state assembly elections, Dr. Ashok Ram won from congress party in collaboration with Mahagathbandhan and defeated Manju Hajari.

Rosera is an active business hub for lychee, jewellery, carpets, clothing, medicine and agriculture.

Rosera has been a hub for spices in the past due to its location near the tributary of River Gandak.

Rosera has bus services to Patna, Ranchi, Samastipur, Darbhanga, Muzzafarpur and Delhi also.