Straight and curved guide rail and straight and curved guide device

A straight-curved guide rail which includes a straight part and a curved part and is configured to guide movement of a movable element, the straight-curved guide rail comprising:

• a base part extending in a longitudinal direction of the straight-curved guide rail;
• and
• a track part, which is formed on the base part, extends in the longitudinal direction, and has a pair of rail ends, each including a track surface to be in contact with the movable element, on both side portions of the straight-curved guide rail in a width direction of the straight-curved guide rail,
• wherein a region of the straight-curved guide rail, which includes an end portion of the straight-curved guide rail in the longitudinal direction, includes a low-stiffness region in which portions including the track surfaces have lower stiffness than stiffness of another region, the low-stiffness region extending in the longitudinal direction to an end surface of the end portion of the straight-curved guide rail.