To provide a method for strengthening a carburizing-treated component by which a high compressive residual stress can inexpensively and easily be imparted onto the outermost surface of a carburizing-treated component, and also, the distribution of the compressive residual stress can be changed according to the target component, when the method is performed by jointly using a carburizing treatment and a shot peenin.

In the method for strengthening a carburizing-treated component, carburizing to a base material W is performed at a carburizing furnace. Regarding carburizing conditions, carburizing temperature is controlled to 950°C, next, temperature is reduced to 850°C, and finally, the object to be treated is subjected to oil quenching (oil cooling) into quenching oil of 130°C. Thereafter, the surface of the carburizing-treated component as the base material W subjected to the carburizing is subjected to shot peening with a mixture obtained in such a manner that the shot grains composed of grains made of steel and an abrasive composed of ceramics particles are mixed.

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