The utility model relates to a structure of a four-wheel walker.There are four columns in the main body of the first department.Any two columns on the same side are connected by two connecting rods.And two of them are provided with a pair of handrails on the column on the same side.The upper and lower bases of each column are connected by cross shaped connecting rods.The upper base of each column can move up and down synchronously with the connecting rod connected.So that the columns can be closed relatively.And the handrail can move down relative to the column and reduce the height.So that the volume of the main body can be effectively reduced.In order to solve the problem that learning aids can not be effectively reduced and are not conducive to storage.一種四輪助行器之結構，係一主體有四立柱，任二位在同邊的立柱間皆以二連桿相接，且其中二位在同邊的立柱上設有一對扶手，藉各立柱之上座和下座以交叉狀之連桿相接，令各立柱之上座可隨所樞接之連桿而同步地上下位移，俾供各立柱可相對靠近而收合，且扶手可相對所在之立柱下移而降低高度，藉此讓主體的體積可有效縮小，以解決習知助行器不能有效縮小而不利於收納的問題。
