Seat slider device

1. A seat slider device comprising:

an upper rail attachable to a seat;

a lower rail slidably holding the upper rail;

a bolt fixing the lower rail to a vehicle body;

a washer through which the bolt passes; and

a retainer configured to retain the bolt to the lower rail before the lower rail is fixed to the vehicle body with the bolt,

wherein

the lower rail comprises:

an elongate bottom plate including a through hole;

a pair of outer vertical plates, the outer vertical plates extending upward respectively from ends of the bottom plate in a short direction;

a pair of upper plates, the upper plates horizontally extending respectively from upper ends of the outer vertical plates to an inside of the lower rail; and

a pair of inner vertical plates, the inner vertical plates extending downward respectively from inner ends of the upper plates,

the retainer comprises:

a spacer constituted of resin, integrated on the washer, and having a tube shape, wherein an outer diameter of the spacer is larger than a gap between the inner vertical plates and an inner diameter of the spacer is equal to or larger than an outer diameter of a head of the bolt; and

a retaining ring constituted of resin and provided on an inner surface of the washer, wherein a threaded portion of the bolt is press-fitted to the retaining ring;

a groove is provided in a surface of the washer;

the spacer and the retaining ring are connected to each other by a resin rod disposed in the groove; and

the retainer is arranged in the lower rail and is configured to retain the bolt with the bolt through the washer and the through hole.

2. The seat slider device of claim 1 , wherein an outer edge of the washer is inclined upward and bites into the spacer.

3. The seat slider device of claim 1 , wherein

a protrusion is provided on the inner surface of the washer, and

the protrusion is configured to bite into the retaining ring.