A work vehicle comprising: an engine ; a hydraulic pump driven by the engine ; a work implement driven by hydraulic fluid discharged from the hydraulic pump ; a travel apparatus driven by the engine ; a power transmission device that transmits drive power from the engine to the travel apparatus ; a controller that controls the power transmission device ; wherein the power transmission device includes an input shaft , an output shaft , a gear mechanism including a planetary gear mechanism , the gear mechanism that transmits rotation of the input shaft to the output shaft , a first motor (MG1) and a second motor (MG2) each connected to rotational elements in the planetary gear mechanism , and a mode switching mechanism that switches a drive power transmission route in the power transmission device to one mode of at least two modes, varying the rotation speeds of the motors (MG1, MG2) varies a transmission speed ratio in the power transmission device , the transmission speed ratio is a ratio of a rotation speed of the output shaft to a rotation speed of the input shaft , the at least two modes includes a first mode, and a second mode used in a range with the higher transmission speed ratio than the first mode, the controller increases the rotation speed of the engine from a first rotation speed of the engine corresponding to a first vehicle speed when the vehicle speed increases beyond the first vehicle speed where the transmission speed ratio reaches a predetermined first value that is less than the maximum value of the transmission speed ratio obtainable by the power transmission device , and when the transmission route is in the second mode, the first value is greater than a second value of the transmission speed ratio at which the rotation speed of the first motor (MG1) and the rotation speed of the second motor (MG2) are equal. an engine ; a hydraulic pump driven by the engine ; a work implement driven by hydraulic fluid discharged from the hydraulic pump ; a travel apparatus driven by the engine ; a power transmission device that transmits drive power from the engine to the travel apparatus ; a controller that controls the power transmission device ; wherein the power transmission device includes an input shaft , an output shaft , a gear mechanism including a planetary gear mechanism , the gear mechanism that transmits rotation of the input shaft to the output shaft , a first motor (MG1) and a second motor (MG2) each connected to rotational elements in the planetary gear mechanism , and a mode switching mechanism that switches a drive power transmission route in the power transmission device to one mode of at least two modes, varying the rotation speeds of the motors (MG1, MG2) varies a transmission speed ratio in the power transmission device , the transmission speed ratio is a ratio of a rotation speed of the output shaft to a rotation speed of the input shaft , the at least two modes includes a first mode, and a second mode used in a range with the higher transmission speed ratio than the first mode, the controller increases the rotation speed of the engine from a first rotation speed of the engine corresponding to a first vehicle speed when the vehicle speed increases beyond the first vehicle speed where the transmission speed ratio reaches a predetermined first value that is less than the maximum value of the transmission speed ratio obtainable by the power transmission device , and when the transmission route is in the second mode, the first value is greater than a second value of the transmission speed ratio at which the rotation speed of the first motor (MG1) and the rotation speed of the second motor (MG2) are equal. <EOS>