A support device for a slide assembly, comprising: a bracket having a pair of support portions and a side portion, the side portion extending between the pair of the support portions, a path defined by the side portion and the pair of the support portions, a rail longitudinally connected to the path of the bracket, the rail having a pair of outer walls and a side wall, the pair of the outer walls located adjacent to the pair of the support portions of the bracket, the side wall extending between the pair of the outer walls, the side wall located adjacent to the side portion of the bracket, characterized by: each of the pair of the support portions having a first support section extending from the side portion, a second support section bending from the first support section, and at least one first protrusion extending toward the path, the at least one first protrusion having a supporting face, each of the pair of the outer walls having a first bent section extending from the side wall, a second bent section extending from the first bent section and at least one protruding portion, the at least one protruding portion having a contact face which is located corresponding to the supporting face, when the pair of the outer walls of the rail move relative to the pair of the support portions of the bracket, the contact face of the at least one protruding portion contacts the supporting face of the at least one first protrusion. a bracket having a pair of support portions and a side portion, the side portion extending between the pair of the support portions, a path defined by the side portion and the pair of the support portions, a rail longitudinally connected to the path of the bracket, the rail having a pair of outer walls and a side wall, the pair of the outer walls located adjacent to the pair of the support portions of the bracket, the side wall extending between the pair of the outer walls, the side wall located adjacent to the side portion of the bracket, characterized by: each of the pair of the support portions having a first support section extending from the side portion, a second support section bending from the first support section, and at least one first protrusion extending toward the path, the at least one first protrusion having a supporting face, each of the pair of the outer walls having a first bent section extending from the side wall, a second bent section extending from the first bent section and at least one protruding portion, the at least one protruding portion having a contact face which is located corresponding to the supporting face, when the pair of the outer walls of the rail move relative to the pair of the support portions of the bracket, the contact face of the at least one protruding portion contacts the supporting face of the at least one first protrusion. each of the pair of the support portions having a first support section extending from the side portion, a second support section bending from the first support section, and at least one first protrusion extending toward the path, the at least one first protrusion having a supporting face, each of the pair of the outer walls having a first bent section extending from the side wall, a second bent section extending from the first bent section and at least one protruding portion, the at least one protruding portion having a contact face which is located corresponding to the supporting face, when the pair of the outer walls of the rail move relative to the pair of the support portions of the bracket, the contact face of the at least one protruding portion contacts the supporting face of the at least one first protrusion.