PURPOSE: To prevent the slip-off of a front wheel even in case of the excessive advance in the initial stage of the riding over and reinforce a base plate at a place where the weight of the automobile concentrates, as for the automobile loading base plate which rides over from the side part.

CONSTITUTION: As for an automobile parking device which is constituted so that the front part of an automobile loading base plate 1 which is formed to a rectangular shape is pivotally installed on a parking space 2 formed along a road 4, and the automobile loading base plate 1 is set turnable between the parking space 2 and the road 4, a supporting frame is installed on the automobile loading base plate 1, and a hollow projecting wall 14 for preventing the wheel slip-off and the reinforcement is erected integrally along the lengthwise direction of the base plate 1 from the supporting frame, positioned at the side part on the opposite side to the passage 4 of the base plate 1.