One health packet Σ chair is arranged to that a user is helped to maintain his health, the spirit that removal generates when user is sitting on a chair for a long time and improves working efficiency and physical stress. The one of one health packet a rear portion of a seat plate of Σ chairs be it is wide, a front of seat plate is narrow. One anus air circulation duct (116) is made of a cockle shape coccyx support recess (114) to " ohm " shape private part crack (121). In seat plate, a hip support recess portion (113) and femur support (118) are formed. A health coating bag is made by a kind of metal or synthetic resin to be mounted on a lower surface in " ohm " shape private part crack. One drying machine is installed in the function of improving a health packet on a bottom dead centre part of health coating bag by blowing wind. It is coated with non-woven fabric sealing.
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