Doctors say the condition of five others is critical.
The mishap took place on the Dhaka-Tangail Highway near Naojorh on Friday morning, said Sub-Inspector Bahar Alam of the Salna highway police outpost.
He identified four of the victims as Saidur Rahman, 20, driver of the human hauler (locally known as ‘leguna), passengers ‘Moni’, 25, ‘Sohel’, 30, and Selina Akter, 30.
The fifth victim is the driver’s assistant.
Alam said three of the victims were killed on the spot.
The fourth died at the Gazipur’s Shaheed Tajuddin Ahmed Medical College and Hospital.
Selina died when the hospital was preparing to transfer her to Dhaka, resident doctor Abdus Salam said.
The injured are Moni’s husband ‘Tamir’, 28, ‘Mamun’, 25, Abdul Quddus, 25, Fakhrul Islam, 35, and Enamul Haq, 35.
Doctor Salam said they had referred the injured to the Dhaka Medical College and Hospital.
On Thursday, at least 24 people were killed in road accidents across Bangladesh – eight of them dying in Gazipur when a DEMU train hit an autorickshaw.