A non-comissioned officer suffered severe head injuries when a Hummer jeep he was repairing slipped from a ramp and the vehicle's reinforced door swung open, hitting the soldier in the head.
The force of the blow caused the soldier to stumble and fall, hitting his head a second time.
The incident occurred on Wednesday night at the IDF command headquarters in Gush Etzion.
The soldier was taken to Hadassah Ein Kerem Hospital in Jerusalem. The military police have launched an investigation and will focus on whether all the safety regulations had been upheld.