A slide rail assembly, comprising: a first rail; a second rail longitudinally movable relative to the first rail; a blocking structure arranged on one of the first rail and the second rail; and an adjusting device arranged on the other one of the first rail and the second rail, the adjusting device comprising an adjusting member, a working member and a fixing frame; wherein the working member is configured to abut against the blocking structure, the adjusting member is configured to rotate to drive the working member to move linearly relative to the fixing frame, in order to adjust a position of the second rail along a longitudinal direction of the first rail when the second rail is retracted relative to the first rail; wherein the fixing frame comprises a first wall and a second wall, a space is defined between the first wall and the second wall, the adjusting member is accommodated in the space, the adjusting member has a first side and a second side opposite to the first side, the first side has a shaft part connected to the first wall, a screwing part of the working member is screwed to the adjusting member from the second side, a contact part of the working member is located outside the space, and the working member is configured to abut against the blocking structure through the contact part; characterized in that the working member further comprises a middle part connected between the screwing part and the contact part, and the second wall has a hole allowing the middle part to penetrate through; wherein the hole and the middle part have non-circular contours corresponding to each other. a first rail; a second rail longitudinally movable relative to the first rail; a blocking structure arranged on one of the first rail and the second rail; and an adjusting device arranged on the other one of the first rail and the second rail, the adjusting device comprising an adjusting member, a working member and a fixing frame; wherein the working member is configured to abut against the blocking structure, the adjusting member is configured to rotate to drive the working member to move linearly relative to the fixing frame, in order to adjust a position of the second rail along a longitudinal direction of the first rail when the second rail is retracted relative to the first rail; wherein the fixing frame comprises a first wall and a second wall, a space is defined between the first wall and the second wall, the adjusting member is accommodated in the space, the adjusting member has a first side and a second side opposite to the first side, the first side has a shaft part connected to the first wall, a screwing part of the working member is screwed to the adjusting member from the second side, a contact part of the working member is located outside the space, and the working member is configured to abut against the blocking structure through the contact part; characterized in that the working member further comprises a middle part connected between the screwing part and the contact part, and the second wall has a hole allowing the middle part to penetrate through; wherein the hole and the middle part have non-circular contours corresponding to each other.