Flight in the seat ascent and descent device (1), flight flight the load joining to seat unit when seat unit has floated, preventing leaning forward of the fixed part component in purpose, the cover of the resin make which surrounds the space where the slider (5) moves, the side wall (32 and 33) from the front section directing to the lower part, the leaning forward obstruction section of leg condition (36 and 37) has extended in (3). The leaning forward obstruction section (36 and 37), because as many as the connected section (2) compared to it has extended to the lower part, the load of the downward look joining flight to the seat unit of a state where it floats, the leaning forward obstruction section (36 and 37) with to support it is possible the load. Therefore, because the fixed part component (20) there are no times when it leans forward, the toilet itself (11) with the fact that the connected section (2) the connected part and the like breaks can be evaded.
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