A slide rail assembly, comprising: a first rail; a second rail longitudinally displaceable with respect to the first rail, wherein the second rail includes a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the second rail; a first component movably disposed on the second rail; and a first operation member movably disposed on the second rail, wherein the first operation member is configured to be operated in order to drive the first component, the first operation member includes a first driving portion, and the first driving portion has a first section and a second section connected to the first section, wherein the first section of the first driving portion has a first transverse height with respect to the longitudinal wall of the second rail, the second section has a second transverse height with respect to the longitudinal wall of the second rail, and the second transverse height is greater than the first transverse height, and wherein when the first operation member is operated, a first guiding feature of the second section of the first driving portion is brought into contact with a first corresponding portion of the first component in order for the first operation member to drive the first component; characterized in that the slide rail assembly further comprises a second component and a second operation member, both movably disposed on the second rail, wherein the second operation member is configured to be operated in order to drive the second component, the second operation member includes a second driving portion, the second driving portion has a first predetermined section and a second predetermined section connected to the first predetermined section, the first predetermined section of the second driving portion has another first transverse height (H1') with respect to the longitudinal wall of the second rail, the second predetermined section has another second transverse height (H2') with respect to the longitudinal wall of the second rail, the another second transverse height (H2') is greater than the another first transverse height (H1'), and when the second operation member is operated, a second guiding feature of the second predetermined section of the second driving portion is brought into contact with a second corresponding portion of the second component in order for the second operation member to drive the second component. a first rail; a second rail longitudinally displaceable with respect to the first rail, wherein the second rail includes a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the second rail; a first component movably disposed on the second rail; and a first operation member movably disposed on the second rail, wherein the first operation member is configured to be operated in order to drive the first component, the first operation member includes a first driving portion, and the first driving portion has a first section and a second section connected to the first section, wherein the first section of the first driving portion has a first transverse height with respect to the longitudinal wall of the second rail, the second section has a second transverse height with respect to the longitudinal wall of the second rail, and the second transverse height is greater than the first transverse height, and wherein when the first operation member is operated, a first guiding feature of the second section of the first driving portion is brought into contact with a first corresponding portion of the first component in order for the first operation member to drive the first component; characterized in that the slide rail assembly further comprises a second component and a second operation member, both movably disposed on the second rail, wherein the second operation member is configured to be operated in order to drive the second component, the second operation member includes a second driving portion, the second driving portion has a first predetermined section and a second predetermined section connected to the first predetermined section, the first predetermined section of the second driving portion has another first transverse height (H1') with respect to the longitudinal wall of the second rail, the second predetermined section has another second transverse height (H2') with respect to the longitudinal wall of the second rail, the another second transverse height (H2') is greater than the another first transverse height (H1'), and when the second operation member is operated, a second guiding feature of the second predetermined section of the second driving portion is brought into contact with a second corresponding portion of the second component in order for the second operation member to drive the second component.