To suppress the hardness deterioration and wear of a cutting edge portion due to friction heat generated when cutting a cut material of an electric saw, and to increase the life of the cutting edge portion.

A groove is provided in a saw blade longitudinal direction on both surfaces or one surface of a saw blade body side surface. By increasing a surface area of the saw blade, friction heat generated during cutting is radiated. When cooling the saw blade by coolant such as water and oil, the coolant is easy to remain in the grooves provided in the saw blade longitudinal direction, so that the cooling efficiency of the saw blade is improved, and the hardness deterioration and wear of the cutting edge portion due to heating is suppressed.

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