The student, Atthawee Kaewthanatsiri, 18, a Saowapha Vocational College student, filed a complaint with the Phra Pradaeng police station on Thursday night.
The student said he and his girlfriend took the orange bus No 82, which is a privately-run bus under concession from the Bangkok Mass Transit Authority, from Pak Klong Talad area in Bangkok to his house in Samut Prakan at 4.05pm.
Atthawee said when the bus reached the Phra Pradaeng Intersection, the couple got down but the door slammed closed while his left hand was still clinging to the door. He said the bus conductor had told them to rush to get down even before the bus had stopped completely.
He did not take note of the serial number on the side of the bus.
Atthawee sought treatment at Paolo Phra Pradaeng Hospital before filing the complaint.
Police will check the schedules for No 82 route and review security camera footage at the spot in order to take legal action against the bus driver.