To provide a work truck having a structure which makes it possible to surely recognize the error of the movement of a bunching device from a desired movement by simulatively operating the bunching device, and enables the easy correction of the error by a worker.

A bunch driving portion having a bunch driving motor 1 and cams 3 to 5 is disposed on the front surface of the work truck Ad. The cams can thereby be adjusted from the front surface of the work truck Ad without taking out the work truck Ad from a machine frame. Since the distance from the bunch driving portion to a bunch lever V is shortened, the links of the bunch driving portion can be reduced in comparison with a case that the bunch driving portion is placed on the deep side of the work truck Ad. A wrench insertion hole 27 is disposed as the manual operation portion of the bunch driving motor 1. A motor shaft 2 can manually be rotated at a low rotation rate by inserting the wrench 29 into the insertion hole 27 instead of the operation of the bunch driving motor 1.