An end yarn processing device capable of cutting an end yarn near a knitted fabric is provided. An end yarn processing device (1) movable along a longitudinal direction of a needle bed (110) of a flat knitting machine (100) includes a catcher (30) that holds an end yarn extending from a gripper device (150) provided at least at an end of the needle bed (110) to a knitting start stitch of a knitted fabric (K) above a needle bed gap (S) of the needle bed (110), and a cutter (60) that cuts the end yarn held above the needle bed gap (S) between a position adjacent to the catcher (30) and the stitch.