In a clutch device in which a diaphragm spring presses a pressure plate to have a friction disc pressed against a rotating part, a clutch device with which a half clutch condition is easily retained is provided. The clutch device comprises: a diaphragm spring comprising a plurality of plate springs arranged along a circumference having a rotation axis as a center wherein end portions thereof projecting toward the rotation axis constitute free ends; a pressure plate to cause the friction disc to be pressed against the rotating part by being biased by the diaphragm spring; and a release device to disconnect power from the rotating part to the friction disc by reducing bias force applied by the diaphragm spring to the pressure plate as the diaphragm spring is deformed by displacing free end portion side of the plate spring in one direction along the rotation axis.