Rotatable circular saw with parallelism adjustment function

A portable circular saw, comprising:

• a saw blade driven by an electric motor;
• a saw cover to cover said saw blade;
• a base mounted on said cover and used to determine depth of cut and to provide a reference when cutting a workpiece;
• and
• means for connecting said saw cover to said base comprising a first connecting means positioned at a front of said saw and a second connecting means positioned at a rear of said saw, wherein said first connecting means is upstream of said saw blade in an advancing direction of said saw when cutting a workpiece;
• wherein said first connecting means comprises means for adjusting parallelism of said saw blade to said base;
• wherein said first connecting means comprises a hinge having a female screw mounted on said saw cover, a hinge holder mounted on said base and having at least two holes aligned with the longitudinal axis of the female screw of said hinge, an adjusting screw inserted into the female screw of said hinge and into the holes of said hinge holder for adjusting parallelism of said saw blade and said base, and a stop member mounted on a tip of said adjusting screw;
• and
• wherein the holes of said hinge holder are spaced apart and the female screw is received between the holes.