The accident happened at 3.30 pm on the E4 near Tornby in Linköping and according to witnesses at the scene, the minibus drove off the road and then flipped around, writes Corren.
In the car were two men, a 60-year-old and a 30-year-old, both from Poland.
Both men were injured, of which the older man was seriously injured.
The cause of the accident is unknown, but the police have drawn up a report of negligence in traffic.