A slide rail assembly, comprising: a first rail including a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the first rail; a second rail (104, 300) including a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the second rail (104, 300), wherein the second rail (104, 300) is displaceable with respect to the first rail from a retracted position in a first direction; and a third rail movably mounted between the first rail and the second rail (104, 300) such that the second rail (104, 300) and the third rail are displaceable with respect to the first rail from the retracted position in the first direction (D 1); wherein the slide rail assembly further comprises a position-limiting member (108, 302) disposed on the second rail (104, 300) at a position adjacent to a front end portion of the second rail; wherein when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, the position-limiting member (108, 302) is fastened to the first rail to prevent the first rail, the second rail (104, 300), and the third rail from separating from one another in a second direction, the first direction and the second direction being substantially perpendicular to each other; wherein the position-limiting member (108, 302) includes a first portion and a second portion extending substantially perpendicularly from the first portion; and when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, the first portion of the position-limiting member (108, 302) is adjacent to a front end portion of the first rail, the front end portion of the second rail (104, 300), and a front end portion of the third rail, and the second portion of the position-limiting member (108, 302) prevents the first rail, the second rail (104, 300), and the third rail from separating from one another in the second direction; the second portion of the position-limiting member (108, 302) is configured to be adjacent to a lateral side of the longitudinal wall of the first rail; wherein the second portion of the position-limiting member (108, 302) will be adjacent to the lateral side of the longitudinal wall of the first rail when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, and the second portion of the position-limiting member (108, 302) and the lateral side of the longitudinal wall of the first rail will be able to contact each other; wherein the first portion and the second portion of the position-limiting member (108, 302) jointly define a space for receiving at least a portion of the first end portion of the first rail and at least a portion of the first end portion of the third rail. a first rail including a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the first rail; a second rail (104, 300) including a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the second rail (104, 300), wherein the second rail (104, 300) is displaceable with respect to the first rail from a retracted position in a first direction; and a third rail movably mounted between the first rail and the second rail (104, 300) such that the second rail (104, 300) and the third rail are displaceable with respect to the first rail from the retracted position in the first direction (D 1); wherein the slide rail assembly further comprises a position-limiting member (108, 302) disposed on the second rail (104, 300) at a position adjacent to a front end portion of the second rail; wherein when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, the position-limiting member (108, 302) is fastened to the first rail to prevent the first rail, the second rail (104, 300), and the third rail from separating from one another in a second direction, the first direction and the second direction being substantially perpendicular to each other; wherein the position-limiting member (108, 302) includes a first portion and a second portion extending substantially perpendicularly from the first portion; and when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, the first portion of the position-limiting member (108, 302) is adjacent to a front end portion of the first rail, the front end portion of the second rail (104, 300), and a front end portion of the third rail, and the second portion of the position-limiting member (108, 302) prevents the first rail, the second rail (104, 300), and the third rail from separating from one another in the second direction; the second portion of the position-limiting member (108, 302) is configured to be adjacent to a lateral side of the longitudinal wall of the first rail; wherein the second portion of the position-limiting member (108, 302) will be adjacent to the lateral side of the longitudinal wall of the first rail when the second rail (104, 300) and the third rail are at the retracted position with respect to the first rail, and the second portion of the position-limiting member (108, 302) and the lateral side of the longitudinal wall of the first rail will be able to contact each other; wherein the first portion and the second portion of the position-limiting member (108, 302) jointly define a space for receiving at least a portion of the first end portion of the first rail and at least a portion of the first end portion of the third rail.