CHAIR

PROBLEM TO BE SOLVED: To provide a chair which sufficiently supports the upper part of the body without giving burden on the back. SOLUTION: A front part of a seat surface 2 is formed as a horizontal surface 5, and a back part is formed as an inclined surface 6 downward. A backrest surface 3 is inclined backward in three stages, an inclination surface 7 at a lower part abuts to the lower back of a seated person up to the pelvis, an inclination surface 8 at a middle part abuts to the back up to the shoulders, an inclination surface 9 at an upper part abuts to the neck and the back part of the head, and the angles of the inclination surfaces 7, 8, 9 are set to be larger at the upper part than the lower part, and larger at the middle part than the upper part.