The planer blade (21), which is mounted on the body (11) of a cutter head (10) for cutting wood, is provided with multiple grooves (26) that extend from the tool edge (24) to the cutting face (22). For the grooves (26), the width (w) is 15-75 µm, the depth (d) is 2-14 µm, the pitch (p) is 40-800 µm, and the ratio (p/w) of pitch (p) to width (w) is 2-16. The roughness of the grooves (26) is rougher than the roughness of the cutting face (22).
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