A slide rail mechanism, comprising: a rail including a longitudinal wall and a supporting portion, wherein the supporting portion is substantially perpendicularly connected to the longitudinal wall and is configured to support a bottom portion of an object, and the longitudinal wall and the supporting portion jointly define a supporting path; and a buffer device provided on the rail, wherein the buffer device includes a base, a movable member, and a buffer member, wherein the movable member includes a contact portion and is longitudinally displaceable with respect to the base, and the buffer member is configured to produce a buffering effect in response to displacement of the movable member in a first direction, wherein when the object is subjected to an external force acting in the first direction, and a rear portion of the object is thereby brought into contact with the contact portion of the movable member, the buffer member produces the buffering effect in response to the movable member being displaced in the first direction; the slide rail mechanism further includes an elastic member for applying an elastic force to the movable member; the elastic member is a spring mounted between a first mounting portion of the base and a second mounting portion of the movable member; wherein while the movable member is displaced from a first position to a second position, the elastic member stores an elastic force in response to the displacement of the movable member in the first direction (D 1), wherein the elastic force acts in a second direction, which is the opposite direction of the first direction; wherein the rail is provided with a front bracket adjacent to a front end of the rail and a rear bracket adjacent to a rear end of the rail, and the front bracket and the rear bracket are configured to mount the rail to a front post and a rear post of a rack respectively, wherein the movable member includes a contact portion corresponding to the supporting path, and wherein the contact portion extends beyond the rear end of the rail. a rail including a longitudinal wall and a supporting portion, wherein the supporting portion is substantially perpendicularly connected to the longitudinal wall and is configured to support a bottom portion of an object, and the longitudinal wall and the supporting portion jointly define a supporting path; and a buffer device provided on the rail, wherein the buffer device includes a base, a movable member, and a buffer member, wherein the movable member includes a contact portion and is longitudinally displaceable with respect to the base, and the buffer member is configured to produce a buffering effect in response to displacement of the movable member in a first direction, wherein when the object is subjected to an external force acting in the first direction, and a rear portion of the object is thereby brought into contact with the contact portion of the movable member, the buffer member produces the buffering effect in response to the movable member being displaced in the first direction; the slide rail mechanism further includes an elastic member for applying an elastic force to the movable member; the elastic member is a spring mounted between a first mounting portion of the base and a second mounting portion of the movable member; wherein while the movable member is displaced from a first position to a second position, the elastic member stores an elastic force in response to the displacement of the movable member in the first direction (D 1), wherein the elastic force acts in a second direction, which is the opposite direction of the first direction; wherein the rail is provided with a front bracket adjacent to a front end of the rail and a rear bracket adjacent to a rear end of the rail, and the front bracket and the rear bracket are configured to mount the rail to a front post and a rear post of a rack respectively, wherein the movable member includes a contact portion corresponding to the supporting path, and wherein the contact portion extends beyond the rear end of the rail.