A work vehicle including an engine mounted on a traveling body including a traveling wheel (3, 4), a hydraulic stepless transmission mechanism that shifts a speed of a driving force from the engine, a gear shift pedal that performs an acceleration/deceleration operation of a shifted output from the hydraulic stepless transmission mechanism, and a control section that controls the engine and the hydraulic stepless transmission mechanism based on an operation amount of the gear shift pedal, the work vehicle being capable of performing an auto-cruise mode of keeping a vehicle speed substantially constant, the work vehicle comprising: an acceleration/deceleration switch (65b, 65c) that increases and reduces a vehicle speed in performing the auto-cruise mode, characterized in that the work vehicle further comprises: a mode shift switch that performs switching among a plurality of traveling modes, wherein the control section stores a maximum vehicle speed set for each of the plurality of traveling modes, and in a case where the acceleration/deceleration switch (65b, 65c) is operated in the auto-cruise mode, the control section increases and reduces the vehicle speed stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum vehicle speed in the traveling mode specified by the mode shift switch; wherein the work vehicle further comprises: an accelerator cooperation switch that performs accelerator cooperation control of changing a vehicle speed in accordance with a pressing amount of the gear shift pedal and changing the number of revolutions of the engine, wherein in a case of shifting to the auto-cruise mode in performing the accelerator cooperation control, when the control section receives an operation on the acceleration/deceleration switch (65b, 65c), the control section increases and reduces the vehicle speed and the number of revolutions of the engine stored in shifting to the auto-cruise mode; wherein the control section stores a maximum number of revolutions of the engine set for each of the plurality of traveling modes, and in a case where the acceleration/deceleration switch (65b, 65c) is operated in the auto-cruise mode during execution of the accelerator cooperation control, the control section increases and reduces the number of revolutions of the engine stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum number of revolutions of the engine in the traveling mode specified by the mode shift switch. a mode shift switch that performs switching among a plurality of traveling modes, wherein the control section stores a maximum vehicle speed set for each of the plurality of traveling modes, and in a case where the acceleration/deceleration switch (65b, 65c) is operated in the auto-cruise mode, the control section increases and reduces the vehicle speed stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum vehicle speed in the traveling mode specified by the mode shift switch; wherein the work vehicle further comprises: an accelerator cooperation switch that performs accelerator cooperation control of changing a vehicle speed in accordance with a pressing amount of the gear shift pedal and changing the number of revolutions of the engine, wherein in a case of shifting to the auto-cruise mode in performing the accelerator cooperation control, when the control section receives an operation on the acceleration/deceleration switch (65b, 65c), the control section increases and reduces the vehicle speed and the number of revolutions of the engine stored in shifting to the auto-cruise mode; wherein the control section stores a maximum number of revolutions of the engine set for each of the plurality of traveling modes, and in a case where the acceleration/deceleration switch (65b, 65c) is operated in the auto-cruise mode during execution of the accelerator cooperation control, the control section increases and reduces the number of revolutions of the engine stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum number of revolutions of the engine in the traveling mode specified by the mode shift switch. an accelerator cooperation switch that performs accelerator cooperation control of changing a vehicle speed in accordance with a pressing amount of the gear shift pedal and changing the number of revolutions of the engine, wherein in a case of shifting to the auto-cruise mode in performing the accelerator cooperation control, when the control section receives an operation on the acceleration/deceleration switch (65b, 65c), the control section increases and reduces the vehicle speed and the number of revolutions of the engine stored in shifting to the auto-cruise mode; wherein the control section stores a maximum number of revolutions of the engine set for each of the plurality of traveling modes, and in a case where the acceleration/deceleration switch (65b, 65c) is operated in the auto-cruise mode during execution of the accelerator cooperation control, the control section increases and reduces the number of revolutions of the engine stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum number of revolutions of the engine in the traveling mode specified by the mode shift switch.