VEHICLE SEAT SLIDE DEVICE

A vehicle seat slide device includes an upper rail, a lower rail, a lock mechanism that restricts movement of the upper rail relative to the lower rail, and a lock release mechanism that performs an unlocking action with the lock mechanism. The lock release mechanism includes an input lever and a release lever. The release lever includes a longitudinal extension, a widthwise extension, and a vertical extension. The release lever is configured so that the vertical extension presses an unlock element as the input lever presses the widthwise extension from above.