A surface treatment processing method comprising: a shot processing step of performing shot processing of shooting shot media at a treatment target; a first inspection step of nondestructively inspecting at least one of a surface side state and an external dimension of the treatment target subjected to the shot processing, and evaluating that the treatment target is passed when an inspection result is within a first normal range set in advance, characterized in that the first inspection step further comprises evaluating that the treatment target is failed when the inspection result is out of a first allowable range set in advance to include the first normal range, and evaluating that the treatment target is to be additionally processed when the inspection result is out of the first normal range but within the first allowable range; and the surface treatment processing method further comprises an additional processing step of performing the shot processing again on the treatment target which is evaluated to be additionally processed, wherein the first inspection step further comprises: outputting a signal representing a voltage value as a result of an inspection performed by a magnetic evaluation device; outputting a signal representing a stress value as a measurement result performed by a stress measurement device; evaluating that the treatment target is passed when the inspection results of the magnetic evaluation device and the stress measurement device are within first normal ranges set in advance; evaluating that the treatment target is to be additionally processed when the inspection result of the magnetic evaluation device is within the first normal magnetic range and the inspection result of the stress measurement device is out of the first normal stress range but is within a first allowable stress range; and evaluating that the treatment target is failed when the inspection result of the magnetic evaluation device is out of the first normal magnetic range or the inspection result of the stress measurement device is out of the first allowable stress range. a shot processing step of performing shot processing of shooting shot media at a treatment target; a first inspection step of nondestructively inspecting at least one of a surface side state and an external dimension of the treatment target subjected to the shot processing, and evaluating that the treatment target is passed when an inspection result is within a first normal range set in advance, characterized in that the first inspection step further comprises evaluating that the treatment target is failed when the inspection result is out of a first allowable range set in advance to include the first normal range, and evaluating that the treatment target is to be additionally processed when the inspection result is out of the first normal range but within the first allowable range; and the surface treatment processing method further comprises an additional processing step of performing the shot processing again on the treatment target which is evaluated to be additionally processed, wherein the first inspection step further comprises: outputting a signal representing a voltage value as a result of an inspection performed by a magnetic evaluation device; outputting a signal representing a stress value as a measurement result performed by a stress measurement device; evaluating that the treatment target is passed when the inspection results of the magnetic evaluation device and the stress measurement device are within first normal ranges set in advance; evaluating that the treatment target is to be additionally processed when the inspection result of the magnetic evaluation device is within the first normal magnetic range and the inspection result of the stress measurement device is out of the first normal stress range but is within a first allowable stress range; and evaluating that the treatment target is failed when the inspection result of the magnetic evaluation device is out of the first normal magnetic range or the inspection result of the stress measurement device is out of the first allowable stress range. outputting a signal representing a voltage value as a result of an inspection performed by a magnetic evaluation device; outputting a signal representing a stress value as a measurement result performed by a stress measurement device; evaluating that the treatment target is passed when the inspection results of the magnetic evaluation device and the stress measurement device are within first normal ranges set in advance; evaluating that the treatment target is to be additionally processed when the inspection result of the magnetic evaluation device is within the first normal magnetic range and the inspection result of the stress measurement device is out of the first normal stress range but is within a first allowable stress range; and evaluating that the treatment target is failed when the inspection result of the magnetic evaluation device is out of the first normal magnetic range or the inspection result of the stress measurement device is out of the first allowable stress range.