A shade device for a vehicle includes: a shade; a retracting mechanism attached to a base end of the shade and retracting the shade in a stored state; a stay attached to a tip end of the shade; an extractable constant force spring; a rod, its tip end portion being attached to the stay and its base end portion being connected to the constant force spring, biased in a deploying direction of the shade by biasing force of the constant force spring, and transmitting the biasing force to the stay; a guide rail that stores the rod and an extracted portion of the constant force spring in the stored state of the shade, and guides the rod when the shade shifts from the stored state to the deploying state; and a locking mechanism that locks movement of the rod in the stored state of the shade.