PURPOSE: To provide a bobbin transfer system equipped with a leading-out device which can improve the pick finding efficiency.

CONSTITUTION: On the downstream side of a pick finding device A, a pick finding mistake bypass passage 2a for discharging a bobbin 1 in the pick finding mistake is connected, and in the leading-out mistake bypass passage 2a, an air stream generating means 9 and an auxiliary pick finding device B which has an air stream control member 5 for controlling the air stream so that the air stream generated by the air stream is set along the surface of the yarn layer 15 of a bobbin 1 erected in a tray T and permits the air stream control member 5 to be installed so as to advance and retreat to the position surrounding a part or the whole of the bobbin 1.