SEAT RAIL DEVICE

To provide an electrically-driven seat rail device which can prevent rattling in a vertical direction while preventing increase of a slide load.SOLUTION: A seat rail device has a vertical backlash prevention member 50 including: a cam 51 having an upper surface slide part 51d which slides on a part of a lower rail formed on an upper surface and an elastic member contact surface 51c formed on a rear end; an elastic member 52 which contacts with the elastic member contact surface 51c at one end and biases the cam 51 to the tip side; a bush 53 including an elastic member support part 53c supporting the other end of the elastic member 52 and an upper rail contact surface 53d which is formed protruding so as to contact with an upper rail; and a housing member 55 having a tip opening 55a formed at a tip, a bottom surface opening 55b formed at the bottom surface side, an upper surface opening 55c formed on the upper surface, and an attachment part attachable to the upper rail, the housing member formed in a container shape.SELECTED DRAWING: Figure 3 【課題】電動式のシートレール装置において、スライド荷重の増加を防止しつつ、上下方向のがたつきを防止することができるシートレール装置を提供する。【解決手段】シートレール装置は、上面に形成されたロアレールの一部と摺動する上面摺動部５１ｄと、後端に形成された弾性部材当接面５１ｃと、を有するカム５１と、弾性部材当接面５１ｃに一方端部が当接し、カム５１を先端側に付勢する弾性部材５２と、弾性部材５２の他方端部を支持する弾性部材支持部５３ｃと、アッパーレールに接触するように突出して形成されたアッパーレール接触面５３ｄと、を備えているブッシュ５３と、先端に形成された先端開口部５５ａと、底面側に形成された底面開口部５５ｂと、上面に形成された上面開口部５５ｃと、アッパーレールに取り付け可能な取付部と、を有する容器状に形成され収容部材５５と、を有してなる上下方向がたつき防止部材５０を有することを特徴とする。【選択図】図３