In an exhaust gas purifying device 101 that includes DPFs 12a and 12b to perform PM regeneration simultaneously through supply of fuel upstream of the DPFs 12a and 12b, an ECU 50 sets a target bed temperature for the purpose of raising the temperature of the DPFs 12a and 12b during PM regeneration, and controls the fuel supplied upstream of the DPFs 12a and 12b in accordance with the set target bed temperature. The ECU 50 detects parameter values relating to the DPFs 12a and 12b, and compares the detected parameter values with a temperature rise condition for raising the target bed temperature. Upon determination that the parameter values in both the DPFs 12a and 12b satisfy the temperature rise condition, the ECU 50 resets a new target bed temperature by raising the target bed temperature set for the DPFs 12a and 12b.