The women and other people were travelling in the truck to Chlala village from Khisri in Amreli, about 260 kms from here, to attend a wedding ceremony when the driver lost control of the vehicle following which it overturned, they said.
Three women died on the spot while one succumbed to her injuries in hospital.
The truck driver was also severely injured, police said.
The injured have been shifted to a hospital in Dhari.