The present invention provides an air suction device for a threading apparatus that creates an air flow to be directed toward a needle eye in order to guide a yarn through the eye. The air suction device is comprised of:(a) an air device externally provided for generating reduced pressure;(b) an air suction pipe connected to the external air device; and(c) an air path leading to a front portion of the air suction pipe.The air path is comprised of a pair of leaf springs to horizontally hold a needle, and upper and lower elastic members which run parallel between the pair of leaf springs. To effectively direct air into the needle eye, an air-tight environment is provided around the needle eye: (1) air entry above and beneath the needle eye is prevented by the body of the needle; (2) air entry from both sides of the needle is prevented by the pair of leaf springs that hold the needle; and (3) air inflow behind the needle is prevented by rear-positioned elastic members which tightly fit the needle.