Anti-skid bearing device, waist supporting device, backrest device and chair

The utility model relates to the technical field of waist and back supporting, in particular to an anti-skid bearing device, a waist supporting device, a backrest device and a chair. The anti-skid bearing device comprises a bearing part and a connecting piece, and connecting rings are arranged at the two ends of the bearing part respectively. The two ends of the bearing part can be installed on two supporting plates arranged on the backrest device in a left-right spaced mode through the connecting pieces through the connecting rings, the bearing part is arranged in the left-right direction and used for bearing the waist support, and when the waist support is adjusted to the set height, non-artificial sliding off in the use process is prevented, and the use safety of the waist support is improved. The problem that a user slides down in the process of using the waist support is solved. The waist support device comprises an anti-skid bearing device, and a bearing part is arranged on the lower side of the waist s