PURPOSE: To provide the yarn trap of a winder operating a shutter at the time of a full-bobbin stop and a miss-knot stop independently from a yarn connecting action so that no yarn is sucked into an air suction port regardless of the strength of the preset tension.

CONSTITUTION: In the yarn trap of a winder 1 provided with an air suction port 11a for sucking and holding a cut yarn end is provided on the yarn passage of a yarn Y wound on a winding package 3 from a feeding package 6 and provided with a shutter 15 opening or closing the air suction port 11a on it, an actuator 16 closing the shutter 15 at the time of a full-bobbin stop and a miss-knot stop of the winding package 3 is provided.