The child's parent filed a complaint alleging that their daughter was abused twice at the reputed private school on Old Madras Road.
Bangalore police said that the man against whom the complaint was made had been arrested three days ago.
On November 26, when the girl returned home from school at around 12.30 pm, the mother noticed that something was wrong with her daughter.
She remained withdrawn and disturbed, then fell ill and could not attend classes for the next two days.
Bangalore Mirror in a report says that the girl told her mother that she was lured by the attendant to an empty classroom with chocolates after the morning prayer and raped her.
When the mother heard this, she rushed her daughter to the nearest hospital for a check up. The doctors confirmed her worst fears and told her that her daughter was raped.
In her complaint to the cops, the mother said that her daughter behaved similarly on the October 22 as well.
The police arrested the alleged molester on November 30 and identified him as Nagaraj.
Incidents of child abuse in Bangalore schools have become a regular occurrence with the latest incident occurring in October 21, where a three-year-old girl was allegedly raped by her school attender.