The accident occurred when the victims were returning late last night to Nangalwadi from Ojhar after taking part in birthday celebrations of one of their friend's daughter.
The driver of the car lost control over wheels following which it overturned and fell into a gorge, police said.
Five persons died enroute to the district hospital while another one succumbed to his injuries later, they said.
The injured person was undergoing treatment in the district hospital.