To enhance the degree of freedom in the movement of a plate member by moving the plate member not only in the vertical direction but also in the horizontal direction.

This lifter 1 is equipped with a driving link 8 and a follower link 9 which are connected with a pair of rail frames 7 approximately parallel with each other and the plate member 3 positioned approximately horizontal, whose central parts are coupled to each other rotatably, and which assume approximately X-shapes in standing states. The plate member 3 is constituted so as to move in the longitudinal direction of the rail frames 7 while vertically moving.