To provide a seat side table provided with a table body for placing articles on a seat side portion at a front side and a tray for placing articles at a rear side capable of placing various articles and being stably drawn-in and drawn-out.

A table body is assembled from an upper cover 1 and an under frame 3 and an inner frame 4 opposed to the under frame 3 is provided in the inside of the table body. A slide guide mechanism is assembled from long holes 40a-40c separately provided on each plate surface and extending in a forward/backward direction of the table body; a vertical pin 7 inserted into the long holes 40a-40c; and calking-stop washers 70, 72 including a wave washer 71 attached to a shaft end side of the vertical pin 7 projected from the long holes 40a-40c. A tray 2, i.e., a part for placing articles is mounted to the inner frame 4 such that it can be drawn-in and drawn-out from an opening of the table body to a rear side.