Exhaust gas control apparatus for internal combustion engine

An exhaust gas control apparatus includes a catalytic device in an exhaust passage, and the catalytic device carrying an NSR catalyst and an oxygen storage agent. A poisoning recovery control section of the catalytic device executes poisoning recovery control and includes: an oxygen storage amount estimation section that estimates an oxygen storage amount of the catalytic device; a determination section that determines timing at which an estimation value of the oxygen storage amount becomes equal to or smaller than an elimination start determination value after a start of elimination processing in the poisoning recovery control as elimination start timing; and a termination timing decision section that decides termination timing of the poisoning recovery control on the basis of a supply amount of a reducing agent to the catalytic device in a period after the elimination start timing during the elimination processing.