Abstract: A mailbox mounting device which returns to its original position after side impact being comprised substantially of a horizontal mounting member, a base plate, a cylindrical cap, a spacer mounting plate, and resilient means for retarding the said cylindrical cap from rotating out of place. The cylindrical cap is affixed to the horizontal mounting member by a pin which fits through a hole in the cylindrical cap and through a hole contained in the cylindrical pivot shaft portion of the horizontal mounting member. This locks these two items in place and permits the base plate and the spacer mounting plate which are attached together to rotate about the horizontal mounting member. The base plate and spacer mounting plate are prevented from rotating more than 90 degrees after side impact by the use of two pivot stopping pins which impact the cap pivot stopping pin as the base plate is rotated.