A slide rail assembly includes a first rail, a second rail, a first structure, a second structure and a disengaging member. The disengaging member is arranged at a position on the second rail to be conveniently operated by a user. When the second rail is moved relative to the first rail to an extended position, the first structure and the second structure are configured to be engaged with each other, in order to hold the second rail at the extended position. Wherein, the disengaging member is configured to disengage the first structure from the second structure.