Coupling Device and Cutting Tool

A coupling device for coupling a first member and a second member, comprising:

• two protruding portions provided on the first member;
• a through hole formed to pass through the second member;
• two reception holes provided in the second member and each formed to connect to the through hole and to receive the protruding portion;
• and
• a fixing member including a first pressing portion and a second pressing portion, wherein the fixing member is configured to, when being disposed in the through hole, be able to move the first pressing portion and the second pressing portion and change a distance between the first pressing portion and the second pressing portion due to application of a force to one end portion of the fixing member, and wherein the first pressing portion is formed to be able to exert a fixing force on one of the two protruding portions received in one of the two reception holes and the second pressing portion is formed to be able to exert a fixing force on the other of the two protruding portions received in the other of the two reception holes.