A kind of folding device of association's step chair,Be set a side arm each axis in two sides be equipped with upper end have handle side frame,And on the side frame below handle again a fixed bridge,And worn on the bridge again one can be pulled upwardly or be pressed downward it is urgent,And the locating rod that can be automatically reset,Lower end with season locating rod can be worn in location notch hole set by conjunction what side arm corresponding position,Make through pulling or compressing of the user to locating rod,The lower end of locating rod is allowed to recess in what location notch hole,And then two sides side frame is allowed to be able to overlap and fold towards switch at side arm,Therefore other than its operation very simplicity is easy,Simultaneously be with simpler construction,It can reach and above-mentioned fold purpose.一種協步椅的折收裝置，是設一前架的兩側各軸設有上端具有握把的側架，並在握把下方的側架上又固設一桿架，且又在該桿架上穿設一可以被向上拉動或被向下壓迫、而能自動復位的定位桿，同時令定位桿的下端可以穿合於前架對應處所設的定位槽孔中，使透過使用者對定位桿的拉動或壓迫，讓定位桿的下端退離於定位槽孔中，進而讓兩側側架得以朝向前架處轉擺而疊合折收，故其操作甚為簡便容易以外，同時是以更簡單的構造，就能達成上述的折收目的。
