Abstract: A circular saw having a driven shaft carrying a saw disk, said saw disk being linked mechanically with the part of a driving shaft disposed together with the driven shaft in a common casing fixed rigidly and dismountably on a saw carrier. Said part of the driving shaft is coupled with the other part of the same shaft, and mounted in a hollow carrier shaft with a possibility of displacing axially when these parts are being detached. With the above embodiment of the circular saw, bearings of these shafts, exposed in operation to most severe wear, can be replaced relatively quickly.