The incident took place late last evening when the woman was alone at her house and the accused, Bhagat Singh, paid her a visit, a police spokesperson said.
Singh, who was known to the victim, asked her for a glass of water. When she went to fetch it, he followed her inside and raped her, police said.
The accused had also threatened to kill the woman.
The victim lodged a complaint with the police yesterday after which a case under IPC section 376 (rape) was registered against Singh, police said, adding, the accused was immediately arrested.