Abstract: A swimming instrument having a simple structure which is capable of preventing the positional shift and water leakage of swimming goggles due to an impulsive water pressure during a swimming race is disclosed. It comprises: swimming goggles including a pair of right and left water-proof goggle frame portions each of which is formed in a tapered cylinder shape, and lens portions each formed integrally with the water-proof goggle frame portions; and a swimming cap having leading edges each caught by the swimming goggles; wherein the swimming goggles further comprises catching ribs for catching the leading edges of the swimming cap, which are each formed integrally with the surfaces of the water-proof goggle frame portions at positions higher than those of the lens portions; and the leading edge of the swimming cap is formed in a shape corresponding to that of the catching rib.