The head-rest (1) has an articulation device (4) connecting an additional structure (3) and a main structure (2). Two housings are provided on one of the structures and separated by a transition zone. A latch is provided on the other structure. A spring ac...

A headrest device ensures the movement of a headrest frame body to a stay and enables a foaming resin molding of a headrest. A support portion having a semicircular cross section and restricting portions having an approximately U-shape cross section are fo...