A working vehicle of the present invention achieves more stabilized constant speed traveling. A vehicle speed control section 20A of a controller 2 calculates a target drive force required for constant speed traveling on the basis of a preset standard traveling resistance (S1). And, on the basis of an output rotational speed (S2) and the target drive force (S1) of a torque converter 14, the vehicle speed control section 20A determines a target input rotational speed (S3) to be inputted to the torque converter 14, and sets a clutch pressure (S5) so as to eliminate a difference between the target input rotational speed and an actual input rotational speed (S4). A standard traveling resistance correction section 20B corrects a standard traveling resistance according to state of a road surface, long term change of components, and so on. Due to this, it is possible to perform stabilized constant speed traveling.
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