To quickly and unerringly form food such as cooked rice into a prescribed shape.

When one grasps a food mass on his palm and forms it into the prescribed shape, a former interposes between the palm and the food mass and assists the formation of the food mass. A former body is formed of an elastically deformable member and follows the inside shape of the palm, wrapping the food mass when a grasping power is applied thereto from the outside, and when the grasping power from the outside is released, it returns to its initial shape.