To provide a rail changeover unit useful for guiding a runner to a predetermined direction even in a branching rail structure where multiple rails are branched and a rail structure equipped with this changeover unit.SOLUTION: An attachment plate 11 attachable to a ceiling wall is attached with a reference rail member 1a connectable to a reference rail body 1b, and a plurality of branched members 2a, 3a connectable to a plurality of branched rail bodies 2b, 3b, and a movable rail member 15 is hinged and attached to the end of the reference rail member 1a in a rotatable manner. The movable rail member 15 is pulled by a spring member (spring) 22. Resisting the elasticity of the spring member, the movable rail member 15 is pulled to be rotated by a crank mechanism 23. Interlocked with the pulling movement of the crank mechanism 23, a plate-like controlling member 28 attached to the movable rail member 15 prevents a runner 31 having entered or moved to a predetermined one of the branched rail bodies 2b, 3b, from running to the direction of the reference rail member 1a and from derailing from the predetermined one of the branching rail bodies 2b, 3b.SELECTED DRAWING: Figure 1【課題】複数のレールが分岐した分岐レール構造であっても、ランナーを所定の方向に案内するのに有用なレール切換ユニット；この切換ユニットを備えたレール構造を提供する。【解決手段】天井壁に取付可能な取付プレート１１に、基準レール本体１ｂと接続可能な基準レール部材１ａと、複数の分岐レール本体２ｂ，３ｂと接続可能な複数の分岐レール部材２ａ，３ａとを取り付け、前記基準レール部材１ａの端部に、可動レール部材１５をヒンジ式に回動可能に取り付け；この可動レール部材１５をバネ部材（スプリング）２２で引き寄せ；このバネ部材の弾性に抗して、クランク機構２３により可動レール部材１５を牽引して回動させ；前記クランク機構２３の牽引動と連動して、前記可動レール部材１５に取り付けられた板状規制部材２８により、所定の分岐レール本体２ｂ，３ｂに進入又は移行したランナー３１が前記基準レール部材１ａの方向に走行して分岐レール本体２ｂ，３ｂから脱輪するのを規制する。【選択図】図１
