To provide a sufficiently uniform large cutting force and to surely carry out chips by situating a cutting tip with a side space to a preceding cutting tip in the direction crossing to chain vertical direction, and moving it after the preceding cutting tip.

A side blade 22 and the part 23a of a roof blade 23 are connected to each other in the mutual transfer part. In the transfer part, a cutting tip part 25 preceding in chain traveling direction is formed. The other cutting tip part 125 is formed on the roof blade 23 with a side space (a) to the chain vertical direction. Accordingly, a cutting edge 29 has the preceding cutting tip part 25 and the succeeding cutting tip part 125. The succeeding cutting tip part 125 is advantageously provided on the side surface 35 of a vertical groove 36 formed on a cutting tooth roof part 24 to divide the cutting tooth roof part to two parts.