To provide a shift operation part structure of a powder-driven working vehicle capable of smoothly achieving the work and the traveling.

In a shift operation part structure of a power-driven working vehicle in which an HST 18 is interposed between a prime mover 17 and right and left traveling parts 3L, 3R, a shift operation tool 56 is interlockingly connected to a swash turning shaft of the HST 18, and the shift operation of the HST 18 is achieved in an interlocking manner with the shift operation of the shift operation tool 56, an operation range regulating mechanism is provided on the shift operation tool 56 to regulate the operation range of the shift operation tool 56.