In an exhaust gas control apparatus for an internal combustion engine, including a supercharger which is provided in an exhaust passage at a position up-stream of a catalyst having an oxidizing ability; turbine rotation energy amount adjusting means (106) for adjusting an amount of energy of exhaust gas, which is used for rotating the turbine of the supercharger; and after-injection performing means for performing after-injection, when a work amount of the compressor is increased by the after-injection, the turbine rotation energy amount adjusting means decreases the amount of energy of the exhaust gas, which is used for rotating the turbine, in order to decrease the increased work amount to zero.