To improve the effect of massaging by arranging a vertically movable slider at the center of the back rest of a chair-shaped pedestal and expanding/shrinking air bags, which are arranged on the left side and right side of the back rest so as to hold the sliding mechanism part and on a seat, by supplying/exhausting pressurized air.

A chair-shaped pedestal 1 is provided with a seat 1a and a back rest 1b, a vertically movable slider 2 composed of roller, etc., is provided as the sliding mechanism at the central part of the back rest 1b, and plural air bags 3 are provided mutually facingly on the left and right sides of the sliding mechanism on the back rest 1b. The air bags 3 are provided separately in left and right lines across the track of the slider 2, air bag 3a on the top stage are provided at the positions for pressing the neck while holding the neck between them, respective left and right lines are composed of plural upper and lower independent air bags 3a, 3b and 3c and respectively equipped with pressurized air hoses 4 communicated to a compressor, and pressurized air can be supplied/exhausted from te compressor to the respective lines. The air bags in the respective lines are expanded by simultaneously supplying pressurized air to the left and right air bags 3a on the top stage, for example, and can be contracted later by exhausting the internal pressurized air and this operation is successively performed to the air bags on the succeeding lower stages.