| 摘要 |
A headrest bushing into which a headrest stay are inserted for supporting a head rest includes a lock mechanism for preventing disengagement of the headrest stay from the headrest bush; and an unlock mechanism having a button for unlocking the lock mechanism and a housing for accommodating which has an opening for manipulating the button, and wherein a surface of the button is placed inwardly from the opening of the housing. The surface of the button is placed correspondently to the opening of the housing or inwardly in a pressing direction from the opening of the housing. The headrest stay has a notch consisting of a horizontal surface and an inclined surface to increase its diameter of slowly downward from the deepest part of the horizontal surface, and wherein the horizontal surface of the notch engages with the lock mechanism.
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