In forced regeneration control of an exhaust gas purification device 12, data for control such as the number of meshes of a data map and the number of data maps for forced regeneration control is reduced and occurrence of torque shock is avoided by smoothly changing a fuel pressure. In the forced regeneration control of the exhaust gas purification device 12, when an operation state of an internal combustion engine 10 is a high-load operation state, normal injection control by stopping multi injection is carried out and according to a rotation speed Ne and a load Q of the internal combustion engine 10, a region for control is divided into a multi-injection control region Rm, a transition region Rt, and a normal injection control region Rn, and in the transition region Rt, data Pt for fuel pressure control obtained by interpolation of data Pml for fuel pressure control on the multi-injection control region Rm side and data Pnl for fuel pressure control on the normal injection control region Rn side is used.