PURPOSE: To provide a weft bobbin-exchanging device for linking the weft with a yarn from a reserve bobbin when the amount of the weft in a delivering bobbin reaches its minimum value, and cutting the yarn of the delivering bobbin between the delivering bobbin and the connecting part and leaving the remaining yarn which must not be woven in a cloth, on the delivering bobbin.

CONSTITUTION: This weft bobbin-exchanging device for a loom is provided by arranging a delivering bobbin 11 and a reserve bobbins 12, 13 on a skewer 130, measuring the amount of a weft on the delivering bobbin 11 and linking the yarns delivered from the reserve bobbin and the delivering bobbin when the amount reaches the minimum adjustable value, and cutting the yarn of the delivering bobbin between the delivering bobbin 11 and the formed or to be formed yarn linking part.