"There's a sign saying 'Haussmann Parking' right in front [of the metro entrance], and ... I made a mistake," the distraught driver told the French news agency, noting that the entrance was nearly level with the street.
"Luckily there was no one on the stairs," said the 26-year-old, who gave his name only as Johan. No one was hurt, and the car, a Dacia Duster, was not damaged.
As he was driving slowly he managed to brake in time to stop the car, leaving the back wheels on the level.
Police were quick to give Johan an alcohol test, which he passed.
An employee of a nearby restaurant said this was not the first time there had been a mistake. A similar incident took place at the site four or five years ago.