The accident took place yesterday near Jhilwada village of Patan district, about 125 kms from here.
The toll rose after five persons succumbed to their injuries in various hospitals including those at Patan and Radhanpur since last night.
Twelve others who were seriously injured, have been admitted to the city hospital, they said.
The state government has declared Rs one lakh as ex-gratia compensation to the kin of the deceased. Chief Minister Narendra Modi also extended his condolences on the tragic death of the victims.
Most of the travellers in the van belonged to minority community of Jhilsan village of Mehsana district and were returning after offering prayers at a Dargah in Radhanpur, when the mishap occurred, police said.
The deceased included 12 children and six women.