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Provided is a chair suited to the use of a keyboard or mouse, the chair has a seat 3 and a rocking backrest 4. The seat 3 comprises a first section 3a, 12a and a second section 3b, 12b. The first section 3a of the seat 3 is affixed to a seat-mounting shell 11 is attached to a base 9, via a seat-moun

Provided is a chair suited to the use of a keyboard or mouse, the chair has a seat 3 and a rocking backrest 4. The seat 3 comprises a first section 3a, 12a and a second section 3b, 12b. The first section 3a of the seat 3 is affixed to a seat-mounting shell 11 is attached to a base 9, via a seat-mounting fixture, so as to be slide forwards and backwards. The backrest 4 has a back cover 14, a back panel 15 and a cushion move downwards while rotating in a seesaw fashion during rocking. The front end of the back cover 14 is connected to the seat-mounting fixture 10 by means of a connecting pin 25. When the chair rocks, the seat 3 moves forwards as a whole while the second section 3b tilts backward.

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1. A rocking chair, comprising: a seat on which a person is to sit;a backrest against which a seated person leans; anda base section that supports the seat and the backrest and that is configured in such a way that, when a seated person leans against the backrest, the seat moves forwards and the bac

1. A rocking chair, comprising: a seat on which a person is to sit;a backrest against which a seated person leans; anda base section that supports the seat and the backrest and that is configured in such a way that, when a seated person leans against the backrest, the seat moves forwards and the backrest tilts backwards while an upper end of the backrest moves backwards and while a lower end of the backrest moves forwards;wherein the seat has a first section including a front end of the seat and a second section including a rear end;the second section can tilt backwards with respect to the first section when viewed sideways;the backrest is supported by backrest guide means so as to descend while tilting backwards;the second section of the seat and the backrest are joined together in such a way that the second section of the seat tilts backwards when the backrest moves downward; andan entirety of the backrest descends while tilting backwards when the seated person leans against the backrest, so that the second section tilts backwards while the entirety of the seat is moving forward. 2. The rocking chair according to claim 1, wherein the backrest guide means has a back support affixed to the base section and that stands up; the backrest has a back cover; and the back cover has a downwardly-opened long groove into which the back support fit. 3. The rocking chair according to claim 2, wherein the back cover is joined to the back support so as to tilt while descending. 4. The rocking chair according to claim 2, wherein the back support is configured of a channel material. 5. The rocking chair according to claim 2, wherein the back support is configured of a metal. 6. The rocking chair according to claim 2, wherein a horizontally long guide pin is provided at upper ends of the back support as an element of the backrest guide means; and a vertically long guide groove into which the guide pin slidably fits is provided on an inner side surface of the long groove of the back cover as an element of the backrest guide means. 7. The rocking chair according to claim 2, wherein the back cover is provided with cover means for covering a guide section without regard to backward tilting of the backrest. 8. The rocking chair according to claim 2, wherein upper ends of the back support are situated at a height between an upper end and a lower end of a back panel. 9. The rocking chair according to claim 2, wherein a guide section for supporting the backrest in such a way that the back rest tilts backwards while moving downwards is provided at upper ends of the back support. 10. The rocking chair according to claim 2, wherein the first section of the seat is attached to a first intermediate fixture joined to the base section so as to be movable back and forth; the second section of the seat is attached to a second intermediate fixture joined to the first intermediate fixture so as to be tiltable in a backward direction; and the backrest is attached to the back support affixed to the second fixture. 11. The rocking chair according to claim 1, wherein a hinge section is formed in a seat panel so as to enable a bendable joint, thereby making up the first section and the second section. 12. The rocking chair according to claim 11, wherein the seat panel is divided into a first section and a second section in correspondence with the first section and the second section of the seat, and a group of slits that are long in a right-left direction of the seat panel are formed between the first section and the second section of the seat panel. 13. The rocking chair according to claim 11, wherein the base section has a housing-shaped base body and a seat-mounting fixture attached to an upper end of the base body so as to be slidable in a front-back direction; and the seat panel is attached directly to the seat-mounting fixture. 14. The rocking chair according to claim 1, wherein the seat has a seat panel made of resin and a cushion material stretched over an upper surface of the seat panel. 15. The rocking chair according to claim 1, wherein the backrest has a back panel and a cushion material stretched over a front surface of the back panel. 16. The rocking chair according to claim 12, wherein the back panel is attached to the back cover such that the back panel can be deformed under body pressure of the seated person, and the back cover and the second section of the seat are joined so as to move synchronously.