The accident occurred near Kashiabari Krishi Farm at about 1 AM when the marriage party was returning to the groom's place after the wedding at Berubari.
While two children -- aged two and five -- died on the spot, two succumbed at the Jalpaiguri Hospital and as many at the North Bengal Medical College Hospital, they said.
The bride, Mahasina Begum (30), died at Jalpaiguri hospital, while the 65-year-old bridegroom Maqbul Hossain was injured.
The driver was among the injured, the sources said, adding six persons were admitted to the North Bengal Medical College Hospital, while four were being treated at Jalpaiguri hospital.