A slide rail comprising a plurality of ball retainers including ball bearings , balls being held in each of the ball bearings; a fixed rail on which the plurality of ball retainers are provided slidably in a sliding direction, the fixed rail including an outer rail mounted on a fixed member and a middle rail provided in the outer rail so as to be slidable in the sliding direction; a moving rail arranged in the fixed rail and configured to engage with the ball bearings to be slidable relative to the plurality of ball retainers ; and a guide member configured to guide insertion of the moving rail and restrict frontward sliding of a first ball retainer, wherein the moving rail is capable of being inserted into and drawn out from the fixed rail by being pulled frontward of the fixed rail to be taken out from the plurality of ball retainers or by being inserted into the plurality of ball retainers from front, the plurality of ball retainers are arranged in the sliding direction along the fixed rail , the plurality of ball retainers include the first ball retainer arranged as a guide retainer on a front end part of the fixed rail and a second ball retainer arranged adjacent to the first ball retainer in the sliding direction and at the rear of the first ball retainer , the guide member is provided at a front end of the middle rail which is located further frontward than the first ball retainer , the middle rail includes a restriction member located between the first and second ball retainers in the sliding direction and configured to restrict sliding of the first ball retainer rearward of the middle rail , and the first ball retainer is arranged so as to be slidable between the guide member and the restriction member . a plurality of ball retainers including ball bearings , balls being held in each of the ball bearings; a fixed rail on which the plurality of ball retainers are provided slidably in a sliding direction, the fixed rail including an outer rail mounted on a fixed member and a middle rail provided in the outer rail so as to be slidable in the sliding direction; a moving rail arranged in the fixed rail and configured to engage with the ball bearings to be slidable relative to the plurality of ball retainers ; and a guide member configured to guide insertion of the moving rail and restrict frontward sliding of a first ball retainer, wherein the moving rail is capable of being inserted into and drawn out from the fixed rail by being pulled frontward of the fixed rail to be taken out from the plurality of ball retainers or by being inserted into the plurality of ball retainers from front, the plurality of ball retainers are arranged in the sliding direction along the fixed rail , the plurality of ball retainers include the first ball retainer arranged as a guide retainer on a front end part of the fixed rail and a second ball retainer arranged adjacent to the first ball retainer in the sliding direction and at the rear of the first ball retainer , the guide member is provided at a front end of the middle rail which is located further frontward than the first ball retainer , the middle rail includes a restriction member located between the first and second ball retainers in the sliding direction and configured to restrict sliding of the first ball retainer rearward of the middle rail , and the first ball retainer is arranged so as to be slidable between the guide member and the restriction member . <EOS>