Swimming assistance mechanism

A swimming assistance mechanism comprising:

• a main body (50) fixed between the palm and the elbow;
• and
• a fin (60) foldably installed on an outer surface of the main body (50), wherein
• the main body (50) is formed of a soft synthetic resin material having a strength, and formed at one side thereof with an opening (1) having a length fitted between a palm and an elbow and opened at intervals in a longitudinal direction in which a groove (2) for exposing a base of a thumb is formed at a front palm contact part to which a hand is inserted, and
• the fin (60) is formed of a durable synthetic fiber, has a U-shape spread outward from the main body (50) except an upper portion on an outer surface of the main body (50) arranged the arm thereon, and is fixed to a plurality of transverse and longitudinal ribs (5)(5′) having hinges (4) on an outer periphery of the main body (50), in which outer ends of the ribs (5)(5′) are connected to a plurality of wires (7)(7′) wound on a wire winding device (6)(6′) at a center of the main body so as to be folded on the outer surface of the main body (50) by elastic force due to wire-winding and unfold while the wires (7)(7′) are pulled and released by a water current overcoming the elastic force.