Those injured in the accident are the driver, conductor of the roadways bus and attendant of the truck.
The driver and conductor were rushed to a hospital in Jaipur, while the attendant was rushed to a nearby hospital, they said.
All passengers escaped unhurt and were shifted to another bus for their onward journey to Jaipur, they said.
The truck's attendant was replacing the tyre in the dark when the bus hit him from behind, they said.