[1] He was a Member of Bihar Legislative Assembly (2015-2020) representing Parsa (Vidhan Sabha constituency) from RJD Party.
Roy made entry into politics in 1985 as member of Bihar Legislative Assembly from Parsa (Vidhan Sabha constituency).
In October 2005 and 2010 Bihar Legislative Assembly elections, he lost to Chhotelal Rai.
[2] He also held the position as Minister of Transport Department of Government of Bihar from 2015 to 2017.
[3][4] Currently, he is serving as Member of Bihar Legislative Assembly from Parsa (Vidhan Sabha constituency) since 2015.