The accident took place late last night on Tarapur- Vataman road, which falls on Baroda-Rajkot Highway. Tarapur is 37 km from here.
The driver of the pick-up van, carrying 21 labourers from Alirajpur district of Madhya Pradesh, tried to overtake a heavy vehicle when a truck coming from the opposite direction collided with it, police said.
"Prima facie, the negligence of driver is the cause of the mishap," Anand Superintendent of Police R V Asari said.
The deceased have been identified as - Lalita Koli (17), Kadri Koli (35), Bhapi Koli (37), Dimalya Koli (50), Narsinh Koli (48), Chatra Koli (15) and driver Rohit Ratilal Solanki.
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The identity of one of the deceased could not be ascertained.
The 14 injured, including some seriously, were being treated at a private hospital in the district while some of them were referred to a hospital in Baroda.
It is feared that the toll may rise.