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 (92a, 92b) 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 (92a, 92b) supporting the rail member.