WORK VEHICLE

A work vehicle includes a controller (47) including: an input revolutions number calculator (67) configured to calculate an input revolutions number (NI); and a vehicle speed controller (48) switchable between a first vehicle-speed control mode and a second vehicle-speed control mode, wherein in the first vehicle-speed control mode, the vehicle speed controller (48) controls a vehicle speed of the work vehicle based on a value detected by the input rotation sensor (62), and wherein in the second vehicle-speed control mode, the vehicle speed controller (48) controls the vehicle speed based on a value calculated by the input revolutions number calculator (67).