An exhaust gas purification controller for controlling bed temperature of a DPF, which is arranged in an exhaust system of an internal combustion engine, at a target bed temperature by supplying fuel to the internal combustion engine. The exhaust gas purification controller includes a control unit and a transitional state detection unit. The control unit, when controlling the bed temperature of the exhaust gas purification catalyst, learns a supply amount of fuel that allows for correction of a difference between the catalyst bed temperature and the target bed temperature in the present state and reflects a learned value obtained through the learning on the supply amount of fuel. The transitional state detection unit detects a transitional state of an exhaust gas flow to the DPF. The control unit restricts the learning when the transitional state of the exhaust gas flow is detected.