Patent ID: 8827229

Claim:
A seat slide locking apparatus, comprising: an elongate-shaped lower rail which is fixed to a vehicle body; an elongate-shaped upper rail which is fixed to a seat; a plurality of open engaging sections provided in a lengthwise direction of one of the lower rail and the upper rail; a first holding hole provided in the other one of the lower rail and the upper rail from the rail that has the plurality of open engaging sections; a holding member which is formed with a second holding hole and is installed on the other one of the lower rail and the upper rail; and a plurality of locking pieces which are inserted into the first holding hole and into the second holding hole of the holding member and which can enter into and exit from the open engaging sections, wherein the plurality of locking pieces include: a first locking piece having a broad width inserting section; and a second locking piece having a narrow width inserting section with a width narrower than the broad width inserting section, the first locking piece and the second locking piece are arranged in one row in such a manner that respective thickness directions thereof are aligned with the lengthwise direction of the other one of the lower rail and the upper rail, and the second holding hole includes a broad width section into which the broad width inserting section is inserted, and a narrow width section which has a width narrower than the broad width section and into which the narrow width inserting section is inserted.