To provide a portable type cutting-off tool exhibiting excellent workability by irradiating at least the front area of a base in the cutting-off direction with a laser beam at any working time.

The portable type cutting-off tool relates to the cutting-off tool equipped with a light beam irradiating device. A cover 1 operatable from the outside is provided to open and close an aperture 7 formed on a saw cover 6 in order to irradiate the neighborhood of the cutting-off portion by a saw blade 9 with a laser beam.