The incident led to train services on the Blue line (Noida City Centre-Dwarka) being disrupted for about 20 minutes.
"Asif, a resident of Sadar Bazar, was standing at platform number 2 on R.K. Ashram Marg Metro Station, in central Delhi, when he suddenly jumped onto the tracks in front of the train heading towards Dwarka," said a Metro official.
The alert train driver, seeing a man on the track, instantly applied the brakes, the official said.
Asif was admitted to Ram Manohar Lohia Hospital where his condition was said to be out of danger.
Police said no suicide note was found on him and they were waiting for his statement to ascertain the reason for his action.