| 摘要 |
The present invention relates to a reclining device that includes an external teeth gear and an internal teeth gear and in which the rotation axis of one of the external teeth gear and the internal teeth gear revolves around the rotation axis of the other, the external teeth gear having external teeth on the outer circumferential surface thereof and being disposed with one of a member on the seat cushion side and a member on the seat back side, and the internal teeth gear having internal teeth of which the number of teeth is larger than that of the external teeth of the external teeth gear and that are configured so as to engage with the external teeth and being disposed with the other of the member on the seat cushion side and the member on the seat back side. The present invention aims to provide a reclining device of which the operation force is small and the operation force varies little. To achieve the aim, one of (a) the plane of each of the external teeth 31 b that engages with the internal teeth 32 b and (b) the plane of each of the internal teeth 32 b that engages with the external teeth 31 b is arranged to be flat, and the other of (a) and (b) is arranged to be convex.
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