Police said the bus, heading from Babatpur to Kachwa, fell in the roadside and overturned after the driver lost control of the vehicle.
According to Circle Officer of Badagaon Abshiek Singh, 30-year-old Dhanjay Dubey was killed on the spot and six others were critically injured. The injured are undergoing treatment at a government hospital.
Dubey's body has been sent for post-mortem, the police officer said.