A slide rail mechanism , comprising: a rail member ; and a first bracket device arranged on the rail member , the first bracket device comprising: a first supporting frame movable relative to the rail member ; a second supporting frame movable relative to the first supporting frame ; and a bracket arranged on the second supporting frame ; wherein the first supporting frame and the second supporting frame are able to be engaged with each other through a first structure and a second structure , in order to be moved simultaneously from a first position along a direction, wherein the slide rail mechanism comprises the first structure and the second structure; wherein the bracket is configured to mount the rail member on a rack ; wherein the first bracket device is arranged on a first side of the rail member , wherein the slide rail mechanism further comprises another rail member movably mounted on a second side of the rail member , wherein the first side and the second side of the rail member are two opposite sides; wherein the first bracket device comprises an elastic member attached on the first supporting frame , the second structure is arranged on one of the second supporting frame and the bracket , characterized in that the elastic member comprises a first elastic portion and a second elastic portion connected to the first elastic portion , the first structure is arranged on the first elastic portion , at least one engaging portion is arranged on the second elastic portion , and the elastic member is connected to the first supporting frame through a reinforcing member , wherein the reinforcing member comprises at least one supporting portion supporting the rail member . a rail member ; and a first bracket device arranged on the rail member , the first bracket device comprising: a first supporting frame movable relative to the rail member ; a second supporting frame movable relative to the first supporting frame ; and a bracket arranged on the second supporting frame ; a first supporting frame movable relative to the rail member ; a second supporting frame movable relative to the first supporting frame ; and a bracket arranged on the second supporting frame ; wherein the first supporting frame and the second supporting frame are able to be engaged with each other through a first structure and a second structure , in order to be moved simultaneously from a first position along a direction, wherein the slide rail mechanism comprises the first structure and the second structure; wherein the bracket is configured to mount the rail member on a rack ; wherein the first bracket device is arranged on a first side of the rail member , wherein the slide rail mechanism further comprises another rail member movably mounted on a second side of the rail member , wherein the first side and the second side of the rail member are two opposite sides; wherein the first bracket device comprises an elastic member attached on the first supporting frame , the second structure is arranged on one of the second supporting frame and the bracket , characterized in that the elastic member comprises a first elastic portion and a second elastic portion connected to the first elastic portion , the first structure is arranged on the first elastic portion , at least one engaging portion is arranged on the second elastic portion , and the elastic member is connected to the first supporting frame through a reinforcing member , wherein the reinforcing member comprises at least one supporting portion supporting the rail member . <EOS>