The police said the injured were admitted to the North Bengal Medical College Hospital including the five seriously injured.
Twenty more passengers with minor injuries were admitted to the Mainaguri district hospital, the police said.
Local people complained the roads between Jalpaiguri and Coochbehar and between Jalpaiguri and Siliguri were full of large potholes in the absence of repair for the last three years ever since the Natinal Highway Authority of India took over them.