The girl, who had a migraine, had been advised by a neighbour to seek the tantric's help. Her mother took her to Kanu Lal, a tantric in Govindpuri area in south Delhi Tuesday evening.
Lal asked her mother to leave the room as he would perform some rituals.
Lal raped the minor girl and fled, police said. Later, the victim told her mother about the assault.
"A medical examination confirmed rape. The accused was arrested from his house Wednesday morning," said a police officer.