Rocking chair and spring unit used therein

The chair is provided with a backrest and the backrest tilts backward via a first back frame (14) that is connected to a base (2). When the backrest is tilted backward, the first back frame (14) rotates around a first axis (16), which then applies a load on a spring unit (50) via a pusher (62). The spring unit (50) comprises a tubular first spring mount (53), a compression coil spring (54) housed therein, and a second spring mount (55) that is fitted into the first spring mount (53) with the front end exposed. The second spring mount (55) is pressed by the pusher (62). When the spring unit (50) rotates around a spindle (60), the operating point of the load changes, and the moment acting on the spring unit changes. The position of the spring unit (50) changes as a result of the rotation of a radial cam (70).