The incident took place on February 6 and the Naraina police station were informed regarding the incident on Monday, they added.
The minor's condition is now stable, she said.
The accused works as a sanitation worker in the 'sulabh sauchalaya', she added.
Delhi Commission for Women Swati Maliwal took to twitter to express her anguish over the incident.
"Now, 5 year old girl raped in Naraina by a 40 year old man. The child has suffered terribly and has bled a lot. On my way to the Hospital to see her. Delhi is truly the RAPE CAPITAL of the world. God help us all!!! (sic)", she said in a tweet.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)