The incident occurred last evening when the girl was returning home from school. The teenager took her to a nearby field and allegedly raped her.
The girl went home crying to her parents who then filed a complaint at an all-woman police station.
A case was registered against the boy under Section 3 and 4 of Protection of Children from Sexual Offences Act, 2012 and he was arrested this morning, they said.
The child has been admitted to the government hospital here.