| 摘要 |
According to this invention, there are provided a stopper (2) capable of stopping a forward tilting of a seat back (11) at a forwardly tilted position, and a stopper operation mechanism (3). The stopper operation mechanism (3) has a main pivoting member (4) that is pivoted through an operation of a forward tilting operation lever (15 or 16), a sub pivoting member (5) that is pivoted with respect to the main pivoting member (4), and a connection spring (6) connecting these tilting members to each other. When the forward tilting operation lever (15 or 16) is operated, the sub pivoting member (5) receives a force from the connection spring (6) to be pivoted together with the main pivoting member (4), causing the stopper (2) to move to an acting position. When the stopper (2) is pushed from the acting position toward a non-acting position, with the forward tilting operation lever (15 or 16) being operated, the sub pivoting member (5) receives a force from the stopper (2) to elastically deform the connection spring (6), and is pivoted with respect to the main pivoting member (4) together with the stopper (2).
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