Patent ID: 8172330

Claim:
A headrest having a head support state in which the headrest is raised with respect to a backrest seat and tilted from the head support state to a storage state, comprising: a support member mounted on an upper part of the backrest seat; a frame engaged rotatably with the support member; frame urging elements for urging the frame to one side; and a lock mechanism provided between the frame and the support member, wherein the lock mechanism comprises: a locking member disposed on the support member and formed with an engagement groove part; an operation lever having a concave part formed so as to be directed toward a support member side and being movable; and a fixing member pivotally supported on the frame rotatably and disposed so as to be crossingly engaged with and disengaged from the engagement groove part of the locking member along with a movement of the operation lever, and the engagement groove part of the locking member is formed so that its upper end side is narrow.