A positioning device (1) is provided with: a guide member (2) extending in a mover movement direction; first and second movers (8, 9) movable in the mover movement direction along the guide member; a first link (12) connected at one end threreof to the first mover so as to be rotatable within a plane; a second link (13) for forming a link mechanism such that the second link (13) is connected at one end thereof to the second mover so as to be rotatable within a plane and is connected at the other end thereof to the other end of the first link so as to be rotatable within the plane, the second link (13) having a greater link length than the first link; and an end effecter (15) mounted to the link mechanism. The length of the guide member in the mover movement direction is equal to the value obtained by adding the link length of the second link to the width of the operation region of the end effecter in the mover movement direction.
