COLLAPSIBLE REAR BUMPER INNER SUPPORT, REAR BUMPER, AND VEHICLE

A collapsible rear bumper inner support, comprising: a support rear face (11), a support front face (14), collapsible ribs (12), and a pair of support side faces (13); the support rear face (11) is opposite to the support front face (14); the pair of support side faces (13) are symmetrically arranged between the support rear face (11) and the support front face (14). A first end of the support side faces (13) is connected to the support rear face (11). A second end of the support side faces (13) is connected to the support front face (14). The support rear face (11), the support side faces (13), and the support front face (14) form a truss; the collapsible ribs (12) are arranged between the pair of support side faces (13); a first end of the collapsible ribs (12) is connected to the support rear face (11). A second end of the collapsible ribs (12) is connected to the support front face, and the collapsible rear bumper inner support is symmetrical in the Y direction. Also disclosed is a rear bumper and a vehicle. The high speed collapse and crumpling of the collapsible rib allows the vehicle body rear metal panels to be protected from deformation, and the rear bumper inner support is lighter and lower cost.