In the present invention, an injection valve is efficiently heated to melt urea crystals at an early stage, to reduce power consumption of a battery, and to mitigate deterioration of a coil. A control device for a reducing agent injection device performs control to fill the injection device with a reducing agent when starting up an internal combustion engine, and to inject the reducing agent into an exhaust path of the internal combustion engine through the injection valve, wherein the control device is provided with an energization control unit that, after the exhaust temperature in the internal combustion engine reaches a level greater than or equal to a prescribed threshold value, performs energization control in which an electric current is passed through the coil of the injection valve for a prescribed period of time, thereby raising the temperature of the injection valve and promoting melting of crystals of the reducing agent that have precipitated into the injection valve.
