A unique corner bumper for use on movable objects and particularly on movable vehicles, such as trucks and truck trailers, to protect a fixed or stationary object, such as a building or other rigid structure, against the force of an impact by the movable object. The corner bumper has a pair of elongate sections integrally connected together at common ends and which elongate sections have generally perpendicularly arranged interiorly presented surfaces and an upper interiorly presented surface of a top wall which is also perpendicularly disposed to the interiorly presented surfaces of the side walls. In this way, the bumper will fit over an upper or lower corner portion of a truck trailer, for example. The bumper has tapered exteriorly presented side wall surfaces so that it is generally resistant to being sheared off of the movable object in the event of an impact with a stationary structure or, for that matter, another movable object which engages the bumper in a shearing position, as on an end portion thereof. Moreover, the corner bumper is provided with interiorly formed openings thereby effectively creating ribs between the openings in the structure which are capable of at least partially collapsing or compressing upon impact with a stationary structure.