An exhaust gas purifying apparatus comprising: an oxidative catalyst and a filter that are disposed in an exhaust gas path of an engine; a fuel injecting device that injects fuel according to a fuel injection pattern; and a control device that is configured to estimate a deposition amount of a particulate matter, the control device setting the fuel injection pattern, and characterised in that; the control device is operable to run a stationary recovery mode and a recovering recovery mode which are control modes to set the fuel injection pattern including post-injection to recover the filter, wherein, in the recovering recovery mode, a weak recovery mode is first run and then a strong recovery mode is run, the control device is operable to run the stationary recovery mode when the deposition amount exceeds an assist threshold value and is equal to a stationary threshold value or smaller, and in the stationary recovery mode, the post-injection amount is maintained at a constant value regardless of the magnitude of the deposition amount, and the control device is operable to run the recovering recovery mode when the estimated deposition amount exceeds a recovery threshold value that is larger than a stationary threshold value, in the weak recovery mode of the recovering recovery mode, a post-injection amount is set to be a weak injection amount when the deposition amount is larger than the stationary threshold value, and in the strong recovery mode of the recovering recovery mode, the post-injection amount is set to be a strong injection amount that is a larger injection amount than an injection amount of the weak injection amount, when the deposition amount is equal to the stationary threshold value or smaller. an oxidative catalyst and a filter that are disposed in an exhaust gas path of an engine; a fuel injecting device that injects fuel according to a fuel injection pattern; and a control device that is configured to estimate a deposition amount of a particulate matter, the control device setting the fuel injection pattern, and characterised in that; the control device is operable to run a stationary recovery mode and a recovering recovery mode which are control modes to set the fuel injection pattern including post-injection to recover the filter, wherein, in the recovering recovery mode, a weak recovery mode is first run and then a strong recovery mode is run, the control device is operable to run the stationary recovery mode when the deposition amount exceeds an assist threshold value and is equal to a stationary threshold value or smaller, and in the stationary recovery mode, the post-injection amount is maintained at a constant value regardless of the magnitude of the deposition amount, and the control device is operable to run the recovering recovery mode when the estimated deposition amount exceeds a recovery threshold value that is larger than a stationary threshold value, in the weak recovery mode of the recovering recovery mode, a post-injection amount is set to be a weak injection amount when the deposition amount is larger than the stationary threshold value, and in the strong recovery mode of the recovering recovery mode, the post-injection amount is set to be a strong injection amount that is a larger injection amount than an injection amount of the weak injection amount, when the deposition amount is equal to the stationary threshold value or smaller.