Abstract: A compact chain saw capable of cutting relatively hard materials and suitable for field work having a saw chain with cutting links each provided with a plurality of teeth having cutting edges thereon and driving notches provided on base portions of the cutting links to be held and pivotally supported by pairs of side links. The cutting edges are displaced in the lateral direction with the base portions of the cutting links in sliding contact with bottom portions (inner peripheral edges) of the guide grooves, and the pairs of side links riding on both side edges of the guide grooves, whereby the saw chain being rotatingly driven is restricted from pivot action and side-run phenomenon during cutting.