Cutting device

The invention provides a cutting device with a structure capable of smoothly exhausting air in a processing chamber. The cutting device comprises a chuck worktable for holding a processed object and a processing member for cutting the processed object with a cutting blade installed on the tail end of a main shaft while supplying cutting liquid to the processed object held on the chuck worktable, and is characterized by comprising a processing chamber. The processing chamber surrounds the chuck worktable and the processing member and accommodates a processing area where the processing member cuts the processed object held on the chuck worktable. The processing chamber comprises an exhaust port that exhausts air in the processing chamber to an exhaust suction source, and an intake that supplies air outside the processing chamber to the processing chamber. The exhaust port is at a downward opening in the high-speed flying direction of the cutting liquid containing the cutting bits because of the high-speed rotat