To provide a switch trough which prevents steel wire rod from being formed of scratch as steel wire rod is scissorwise supported by a crop shear and a trough is rocked downward.

The switch trough which feeds steel wire rod m to a crop shear 2, 2 comprising a trough 1 shaped as a box switching the transfer direction of steel wire rod in which the entry side is pivotably installed and delivery side is installed as freely rocking up and down, and a set of guide rollers 10 installed in a manner of unrestricted rotation on the upper part of a transfer path of steel wire rod 11 attached at the trough 1. Just as steel wire rod m is scissorwise supported by the crop shear 2, 2 while the trough 1 is rocking downward, the bent steel wire rod m comes into contact with the guide rollers 10. Consequently, since steel wire rod m is supported and transferred by the guide rollers 10, it prevents a scratch from occurring on the steel wire rod m.