A yarn producing apparatus is provided that produces carbon nanotube yarn at high speed. The yarn producing apparatus 1 includes a yarn producing unit 5 that aggregates running carbon nanotube fibers F. The yarn producing unit 5 includes a nozzle body 10, a first nozzle 20 provided in the nozzle body 10 to generate a first swirl flow, with compressed air, in a direction orthogonal to the direction of the carbon nanotube fibers F running, and a second nozzle 30 provided in the nozzle body 10 to generate a second swirl flow, with compressed air, in a direction orthogonal to the direction of the carbon nanotube fibers F running and opposite to the direction of the first swirl flow. The first nozzle 20 and the second nozzle 30 are provided at positions different in the direction of the carbon nanotube fibers F running in the nozzle body 10.