To freely place a work on a table surface and to easily and smoothly move a round saw main body downward at the time of cutting the work.

A cutting device 1 on which a round saw main body 3 is installed on a rail 5 provided above a table 2 to place a work on it free to travel is constituted by installing a support base 7 on the rail 5 free to slide, assembling a quadric parallel link mechanism 12 on the support base 7 free to tilt in the vertical direction, supporting the round saw main body 3 on a shaft supporting portion 15 below the quadric parallel link mechanism 12 free to tilt in an overhung state and to elastically support the round saw main body 3 against the support base 7 by elastically installing extension springs 21, 22 respectively between the support base 7 and the shaft supporting portion 15 and one part of the quadric parallel link mechanism 12 and the round saw main body 3.