Positioner of chair adjusting device

A positioner of a chair adjusting device, wherein the positioner is formed by stacking a plurality of positioning plates together;

• each individual piece of the positioning plates is formed with a positioning section, a combination section, and a penetration section;
• the combination section is formed of a recessed cavity recessed from one surface and a projecting peg projecting from an opposite surface, an outside diameter of the projecting peg corresponding to an inside diameter of the recessed cavity, so that for two of the positioning plates that are stacked together to be respectively on an upper side and a lower side, the projecting peg of the positioning plate on the upper side is receivable into and fit in the recessed cavity of the positioning plate on the lower side to have the two positioning plates that are stacked together on the upper and lower sides combined together through tight fitting,
• wherein the plurality of positioning plates comprise a lowermost positioning plate and multiple positioning plates sequentially stacked on the lowermost positioning plate in an upward direction, wherein the projecting peg of the lowermost positioning plate is pressed in the upward direction with a stamping pillar so as to cause inward shrinkage of the projecting peg of the lowermost positioning plate in the upward direction, and the multiple positioning plates stacked on the lowermost positioning plate absorb, in a progressively reducing manner, an amount of the inward shrinkage of the projecting peg of the lowermost positioning plate.