The mishap took place at Kalwani village, about 120 kms from here.
The vehicle's brakes failed when the driver was reversing it, causing it to tumble into a roadside well, Superintendent of Police Bhagwant Singh Chouhan said.
The marriage party was returning to Balwani village from Kalwani, he said, adding that the injured were pulled out of the well and admitted to a local hospital for treatment.
On getting information about the accident, local MLA Mukam Singh Kirade went to the hospital and enquired about the injured.