A work vehicle comprising: a vehicle body that is provided with a plurality of wheels ; an engine that is mounted on the vehicle body; a variable displacement traveling hydraulic pump that is driven by the engine ; a variable displacement traveling hydraulic motor that is connected to the traveling hydraulic pump through a closed-circuit and transmits a driving force of the engine to the plurality of wheels ; and a controller configured to control the traveling hydraulic motor , wherein the work vehicle comprises: a pressure sensor configured to detect a load pressure of the traveling hydraulic motor ; and a vehicle speed sensor configured to detect a vehicle speed, characterized in that the controller is configured to limit, in a case where a detection pressure value (P) detected by the pressure sensor is equal to or less than a switching pressure value (Ps) corresponding to a switching point in the traveling hydraulic motor between a maximum displacement volume (qmax) and a minimum displacement volume (qmin), and the detection vehicle speed value (V) detected by the vehicle speed sensor is less than a predetermined upper limit vehicle speed (Vmax) during flat ground traveling of the vehicle body, the minimum displacement volume (qmin) of the traveling hydraulic motor to a first minimum displacement volume value that is less than a value of the minimum displacement volume (qmin) of the traveling hydraulic motor which is associated with the upper limit vehicle speed (Vmax). a vehicle body that is provided with a plurality of wheels ; an engine that is mounted on the vehicle body; a variable displacement traveling hydraulic pump that is driven by the engine ; a variable displacement traveling hydraulic motor that is connected to the traveling hydraulic pump through a closed-circuit and transmits a driving force of the engine to the plurality of wheels ; and a controller configured to control the traveling hydraulic motor , wherein the work vehicle comprises: a pressure sensor configured to detect a load pressure of the traveling hydraulic motor ; and a vehicle speed sensor configured to detect a vehicle speed, characterized in that the controller is configured to limit, in a case where a detection pressure value (P) detected by the pressure sensor is equal to or less than a switching pressure value (Ps) corresponding to a switching point in the traveling hydraulic motor between a maximum displacement volume (qmax) and a minimum displacement volume (qmin), and the detection vehicle speed value (V) detected by the vehicle speed sensor is less than a predetermined upper limit vehicle speed (Vmax) during flat ground traveling of the vehicle body, the minimum displacement volume (qmin) of the traveling hydraulic motor to a first minimum displacement volume value that is less than a value of the minimum displacement volume (qmin) of the traveling hydraulic motor which is associated with the upper limit vehicle speed (Vmax). a pressure sensor configured to detect a load pressure of the traveling hydraulic motor ; and a vehicle speed sensor configured to detect a vehicle speed, characterized in that the controller is configured to limit, in a case where a detection pressure value (P) detected by the pressure sensor is equal to or less than a switching pressure value (Ps) corresponding to a switching point in the traveling hydraulic motor between a maximum displacement volume (qmax) and a minimum displacement volume (qmin), and the detection vehicle speed value (V) detected by the vehicle speed sensor is less than a predetermined upper limit vehicle speed (Vmax) during flat ground traveling of the vehicle body, the minimum displacement volume (qmin) of the traveling hydraulic motor to a first minimum displacement volume value that is less than a value of the minimum displacement volume (qmin) of the traveling hydraulic motor which is associated with the upper limit vehicle speed (Vmax). <EOS>