The accident happened on the Chiang Mai-Hod road.
The overturned after it hit the pole and rescuers from the Putthasawan Nopparat Foundation had to use iron cutters to remove victims from the vehicle.
All the victims came from Ban Huay Nam Dib village in Tambon Kuang Pao in Chiang Mai's Jom Thong district.
Police have yet to determine the cause of the accident.