An electric vehicle including a battery and a plurality of motors (3A, 3B), the electric vehicle comprising an operating mode control device for determining an operating mode in an operation of a predetermined travel route from a plurality of operating modes each defining the number of motors to be driven in the electric vehicle, the operating mode control device comprising: a travel driving force information acquisition unit configured to acquire travel driving force information indicating a time-series travel driving force required for traveling on the travel route; a vehicle speed information acquisition unit configured to acquire information on a time-series vehicle speed planned for the traveling on the travel route as vehicle speed information; a motor operation estimation unit configured to estimate a time-series torque and rotation speed required for the motors when traveling on the travel route on the basis of the travel driving force information and the vehicle speed information; an efficiency calculation unit configured to acquire a time-series efficiency value when traveling on the travel route by each operating mode on the basis of motor operation estimation information which is information on the estimated time-series torque and rotation speed of the motors by referring to motor efficiency information in which the torque and the rotation speed of the motors are associated with the efficiency value of the motors and calculate a total efficiency value of each operating mode on the basis of the acquired time-series efficiency value; an operating mode determination unit configured to determine an operating mode with highest efficiency shown in the total efficiency value as a default operating mode; and an operation control unit configured to control the electric vehicle by the default operating mode, wherein the electric vehicle includes a lift axle mechanism configured to perform levitation control so that a vehicle wheel of one axle of a first axle and a second axle does not contact a ground and perform ground contact control so that a vehicle wheel of the other axle contacts a ground, wherein the number of the motors (3A,3B) is two, wherein the operating mode includes a first operating mode driven by one motor and a second operating mode driven by two motors, and wherein the operating mode control device further includes an axle state control unit configured to perform any one of the levitation control and the ground contact control on the first axle and the second axle and perform the levitation control on any one of the first axle and the second axle when the operation control unit controls the electric vehicle by the first operating mode. a travel driving force information acquisition unit configured to acquire travel driving force information indicating a time-series travel driving force required for traveling on the travel route; a vehicle speed information acquisition unit configured to acquire information on a time-series vehicle speed planned for the traveling on the travel route as vehicle speed information; a motor operation estimation unit configured to estimate a time-series torque and rotation speed required for the motors when traveling on the travel route on the basis of the travel driving force information and the vehicle speed information; an efficiency calculation unit configured to acquire a time-series efficiency value when traveling on the travel route by each operating mode on the basis of motor operation estimation information which is information on the estimated time-series torque and rotation speed of the motors by referring to motor efficiency information in which the torque and the rotation speed of the motors are associated with the efficiency value of the motors and calculate a total efficiency value of each operating mode on the basis of the acquired time-series efficiency value; an operating mode determination unit configured to determine an operating mode with highest efficiency shown in the total efficiency value as a default operating mode; and an operation control unit configured to control the electric vehicle by the default operating mode, wherein the electric vehicle includes a lift axle mechanism configured to perform levitation control so that a vehicle wheel of one axle of a first axle and a second axle does not contact a ground and perform ground contact control so that a vehicle wheel of the other axle contacts a ground, wherein the number of the motors (3A,3B) is two, wherein the operating mode includes a first operating mode driven by one motor and a second operating mode driven by two motors, and wherein the operating mode control device further includes an axle state control unit configured to perform any one of the levitation control and the ground contact control on the first axle and the second axle and perform the levitation control on any one of the first axle and the second axle when the operation control unit controls the electric vehicle by the first operating mode.