PURPOSE: To reduce production of heat by constructing a circular saw with a base metal section and a cutter teeth section fixed with a super hard chip.

CONSTITUTION: A circular saw 10 is comprised of a base metal section 12 and a cutting teeth section 16 fixed with a super-hard chip 14 while a saw fixing hole 18 is provided at the central portion and three grinding sections 20 are provided circularly with same angular interval between said fixing hole 18 and the teeth section 16. The relation between the saw setting dimension (T1) of the super hard chip 14, the thickness (T3) of the base metal section 12 and the dimension (T2) of the material grinding section 20 is such that T1>T2>T3. With such arrangement when cutting the material by means of the circular saw, production of heat is prevented while the vibration and the noise of the circular saw are prevented resulting in of the service life.