They were on their way from Karoli to Rampur on Neerath- Pandadhar link road when their car fell into the gorge, killing them on the spot, the police said.
The police reached the spot and extricated the bodies from wreckage.
The deceased have been identified as Kehar Singh (68) and his wife Rukmani (65), Banti (32) and driver of the car Lovely.