Patent ID: 8490940

Claim:
A seat track apparatus comprising: a first rail provided on one of a floor side and a seat side; a second rail provided on the other one of the floor side and the seat side and engaging the first rail so as to be movable relative to each other; and a lock mechanism configured to prohibit the relative movement of the first rail and the second rail, including an unlocking lever that moveable to permit relative movement of the first rail and the second rail: characterized in that the lock mechanism includes: a plurality of lock grooves formed on the first rail along the direction of relative movement so as to have a depth in the direction intersecting the direction of the relative movement; and a resilient lock member having a lock portion which is engageable and disengageable with the lock grooves, arranged on the second rail along the direction of relative movement, and locked at both end portions thereof with the second rail so that the lock portion engages the lock grooves in a natural state, and the lock member further includes: a first press-contact portion formed on one side of a straight line passing through the both end portions in press-contact with the second rail to prohibit the rotation of the lock member in one direction about the straight line passing through the both end portions as the center axis of rotation, a second press-contact portion formed on the other side of the straight line in press-contact with the second rail to prohibit the rotation of the lock member in the other direction about the straight line passing through the both end portions as the center axis of rotation.