A mobile auxiliary device and a connecting structure for the mobile auxiliary device, the mobile auxiliary device includes a first frame, a second frame and a connecting structure, the first frame includes a first bracket and a first wheel, a second frame It includes a second bracket and a second wheel. The second bracket includes a support rod and a bearing portion； the connection structure includes a first connection plate and a fixing bolt, the first connection plate is connected to the first bracket, and the first connection plate has a clamping slot The contact surface and the perforation, the clamping slot is sleeved on the support bar, and the contact surface is provided on each of the bearing parts； the fixing bolt is arranged on the second bracket, the fixing bolt comprises a positioning bolt body, and the clamping slot is sleeved on the support rod When the abutment surface abuts on the bearing portion, the positioning bolt system can move between the locking position and the release position. In the locking position, the positioning bolt body penetrates into the perforation, and in the release position, the positioning bolt body leaves the perforation.一種行動輔具與用於行動輔具的連接結構，該行動輔具包括有第一車架、第二車架及連接結構，第一車架包含第一支架與第一車輪，第二車架包含第二支架與第二車輪，第二支架包括支撐桿與承靠部；連接結構包含第一連接板與固定栓，第一連接板與第一支架連接，第一連接板具有卡槽、抵接面及穿孔，卡槽供套設於支撐桿，抵接面供抵靠於各該承靠部；固定栓設置於第二支架上，固定栓包括定位栓體，卡槽套設於支撐桿且抵接面抵靠於承靠部時，定位栓體係可於鎖定位置與釋放位置移動，於鎖定位置時，定位栓體穿入穿孔，於釋放位置時，定位栓體離開穿孔。
