An exhaust gas control apparatus for an internal combustion engine, the exhaust gas control apparatus comprising: an addition valve configured to add urea water to an exhaust passage of the internal combustion engine; a tank configured to store the urea water; a urea water passage that connects the addition valve and the tank so as to circulate the urea water; a pump configured to circulate the urea water to the urea water passage; a selective reduction-type nitrogen oxides catalyst disposed in a portion of the exhaust passage on a downstream side of the addition valve, the selective reduction-type nitrogen oxides catalyst being configured to purify nitrogen oxides in the exhaust passage using the urea water; and an electronic control unit configured to, after the internal combustion engine is stopped: (i) control the pump, as a first control, such that a specified amount of the urea water stored in the addition valve and the urea water passage is returned to the tank; (ii) control the pump, as a second control, such that the specified amount or more of the urea water in the tank is discharged from the tank to the urea water passage after the first control is executed; and (iii) control the pump, as a third control, such that all the urea water stored in the addition valve and the urea water passage is returned to the tank after the second control is executed; whereby the addition valve is open during each of the first, second and third control. an addition valve configured to add urea water to an exhaust passage of the internal combustion engine; a tank configured to store the urea water; a urea water passage that connects the addition valve and the tank so as to circulate the urea water; a pump configured to circulate the urea water to the urea water passage; a selective reduction-type nitrogen oxides catalyst disposed in a portion of the exhaust passage on a downstream side of the addition valve, the selective reduction-type nitrogen oxides catalyst being configured to purify nitrogen oxides in the exhaust passage using the urea water; and an electronic control unit configured to, after the internal combustion engine is stopped: (i) control the pump, as a first control, such that a specified amount of the urea water stored in the addition valve and the urea water passage is returned to the tank; (ii) control the pump, as a second control, such that the specified amount or more of the urea water in the tank is discharged from the tank to the urea water passage after the first control is executed; and (iii) control the pump, as a third control, such that all the urea water stored in the addition valve and the urea water passage is returned to the tank after the second control is executed; whereby the addition valve is open during each of the first, second and third control. (i) control the pump, as a first control, such that a specified amount of the urea water stored in the addition valve and the urea water passage is returned to the tank; (ii) control the pump, as a second control, such that the specified amount or more of the urea water in the tank is discharged from the tank to the urea water passage after the first control is executed; and (iii) control the pump, as a third control, such that all the urea water stored in the addition valve and the urea water passage is returned to the tank after the second control is executed; whereby the addition valve is open during each of the first, second and third control.