PURPOSE: To attain planting work for all working processes by automatic traveling.

CONSTITUTION: This traveling control device is provided with plural image pickup means S1 for photographing the front side positions of a working vehicle V in two-dimensional, directions, a boundary detecting means 101 for detecting a planting boundary between an unplanted working area M1 and a planted working area in the body lateral width direction based on the image pickup information and a steering control means 102 for controlling the steering of the vehicle V so as to automatically traveling along the planting boundary in each of plural working processes based on the detection information of the means 101. The means 101 is constituted so as to detect a working area boundary Lk between the unplanted working area M1 in the vehicle lateral width direction and a non-working area N adjacent to the area M1 based on the image pickup information and the means 102 is constituted so as to optionally switch the steering to a steering control state for automatically traveling the vehicle V along the planting boundary L detected by the means 101 and a steering control state for automatically traveling the vehicle V along the working area boundary Lk detected by the means 101.