<p>A riding type rice transplanter enabling secure working when a worker operates a traveling frame from the ground, comprising a front wheel differential device switchable between a differential gear operating state in which the rotating power of an engine is uniformly distributed to right and left front wheels and a differential gear lock state in which the right and left front wheels are rotated integrally with each other. An upper column (46) having a steering wheel at its upper end and a lower column (45) are formed to be longitudinally bendable through a tilt mechanism (47). When the forward tilted upper column (46) is bent to a contained angle of a prescribed value or lower relative to the lower column (45), an interlocking mechanism (67) interlocking with that action operates to bring the front wheel differential device in the differential gear lock state.</p>
