PURPOSE: To achieve a saving of labor in work of handling tables during and after the use of a seat by attaching a table device adapted to fold a deck or tilt a leg frame automatically to a front end part of a moving bed base.

CONSTITUTION: In a seat A which allows a multiple-stage moving bed base 2 to move stretching longitudinally, a table device 6 which enables the inclination of a folding table leg frame 7 on a deck 11 is attached at the position of a front end part of the moving bed base 2. In the stretching of the seat A, the deck 11 is energized to be made ready for use as a horizontal table and when the seat A is reduced to incline the table leg frame 7 forward, a rear stage deck 11 pushes up a front stage deck 11 so that the decks 11 of respective stages are turned to erect automatically in a vertical way sequentially. The deck 11 is always energized horizontally with a spring centered on a table shaft 12 to be made ready for use as table so that the deck 11 can be folded. The table device 6 makes the deck 11 erect vertically to fold when it is inclined forward.