A slide rail assembly includes an outer rail, an intermediate rail, an inner rail, and a latch member pivotably mounted to the intermediate rail. The outer rail includes a support bar and a holding portion. The inner rail includes a stop portion. The latch member includes a first lock tongue and a second lock tongue. When the support bar supports the first lock tongue of the latch member to keep the latch member at a locking position, the second lock tongue of the latch member abuts against the stop portion, to enable the intermediate rail to slide in synchronization with the inner rail. When the latch member slides along the support bar to engage with the holding portion of the outer rail, the latch member is biased to pivot to an unlocking position, the second lock tongue of the latch member disengages from the stop portion.