Acting on the 15-year-old girl's complaint, the accused was arrested yesterday when he was on his way to Sultanpur in Uttar Pradesh, police said.
The girl had alleged that the accused had raped her and also used to threaten to kill her if she told about the incident to anyone.
She was medically examined and the reports confirmed that she was pregnant, they said.
A case was registered under sections 376 (rape) and 506 (criminal intimidation) of the IPC and under provisions of the Protection of Children from Sexual Offences (POSCO) Act on the basis of the girl's complaint, they said.