A slide rail includes: a rail assembly 2; an inner rail 4 mounted on the rail assembly 2, and slidable in a longitudinal direction of the rail assembly 2; and a locking arm 5 a rear end portion of which is secured to a surface of the inner rail 4 facing the rail assembly 2, and a front end portion of which is a free end, wherein the locking arm 5 has a lock protrusion portion 5a that, when pulling out the inner rail 4 from the rail assembly 2, locks slide at a predetermined position, and wherein the rail assembly 2 has a lock hole 2a for catching the lock protrusion portion 5a.