The accused was arrested after he was given a chase by the victim in his BMW car in northwest Delhi's Adarsh Nagar area.
The accused also had two accomplices who managed to flee.
The incident happened last night when Varun Bahal, a call centre owner, and his friend Kabir were on their way to Model Town to meet their common friend.
"Varun was on the wheel when they were stopped by three persons on motorcycle. Brandishing pistols, the accused asked Varun and his friend to open the car's door," said a senior police officer.
More From This Section
The attackers managed to rob them of Rs 1 lakh, two gold chains and a gold bangle, he said.
Varun chased the accused and also alerted the PCR van. On reaching near Azadpur Complex, Varun rammed his car into the attacker's motorcycle due to which they fell on the road.
Two of the accused fled from the spot while one of the accused, Sagar was nabbed.
Sagar already has cases of robbery and theft registered against him. Police are looking for the other accused now.