A vector control device for controlling a power converter (2) that converts DC power to AC power, and supplies AC power to an AC electric motor (1), the device comprising: a vector control unit (3) which calculates, on the basis of a torque command and a magnetic flux command, the output voltage to be output by the power converter (2) by means of vector control, and generates, on the basis of the output voltage, a PWM signal for controlling the power converter; a first magnetic flux command generation unit (11a) for generating a magnetic flux command for an asynchronous PWM mode; and a second magnetic flux command generation unit (11b) for generating a magnetic flux command for a synchronous PWM mode. Therein, if the output frequency of the power converter (2) is less than a specific value, the magnetic flux command generated by the first magnetic flux command generation unit (11a) is input to the vector control unit (3), and if the output frequency of the power converter (2) is at least the specific value, the magnetic flux command generated by the second magnetic flux command generation unit (11b) is input to the vector control unit (3).