Pralhad Rokade hanged himself from a toilet window using a rope made out of a bed-sheet in barrack No 2 of the jail in North Maharashtra, Nashik Road Police Station Inspector Narayan Nyahalde said.
His body has been sent for post-mortem to Nashik Civil Hospital, he said.
On December 29 last year, Rokade was convicted in a rape case and was undergoing sentence here.