A control device for an AC electric vehicle that is applied to a configuration in which an SIV is connected to an intermediate DC circuit unit between a CONV that converts an AC voltage input through a main transformer to a DC voltage and an INV that converts the DC voltage to an AC voltage, in which a carrier frequency fc of the CONV is changed on the basis of initial temperature (initial value of Tcnv) of a converter main circuit element when a vehicle is stopped and input current Isiv of the SIV such that a temperature variation of a converter main circuit element when the vehicle is stopped is reduced.