To provide a more inexpensive production method for a crawler bush where the securance of oil sealing properties as an oil-sealed crawler bush, the securance of excellent toughness to an impact, severe load, and the improvement of wear resistance and a wear life are attained.

For example, a means where, after preferential cooling from the outer circumferential face or inner circumferential face for a crawler bush 5 whose whole body is heated, the whole circumferential face is cooled, or a means where, during the preferential cooling, high frequency heating is performed from the opposite face thereof is performed, so as to be a constitution in which an outer circumferential hardened layer 2, an edge face hardened layer 4 and an inner circumferential tempered martensite hardened layer 6 are formed, and a soft layer 1 formed between the outer circumferential hardened layer 2 and the inner circumferential tempered martensite hardened layer 6 is composed of one or more selected from a pearlite structure, a bainite structure, a martensite and a tempered martensite structure, and the soft layer is connected to the inner circumferential face of the edge face part.

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