Clamping device

A clamping device comprising:

• a one end portion having:
• a first projection on an inner side, and
• a locked part at a tip;
• an other end portion having:
• a second projection at a position facing the first projection, and
• a locking part capable of locking the locked part;
• a middle portion continuous with the one end portion and with the other end portion;
• and
• an insertion hole allowing a flexible tube to be inserted between the first projection and the second projection,
• wherein a clamped state where the locked part is locked by the locking part is established when the one end portion is pressed and is brought closer to the other end portion, and an unclamped state is established when the locked part locked by the locking part is unlocked by bending the other end portion, the clamping device being configured to clamp the flexible tube in the clamped state where the first projection and the second projection are positioned close to each other and to intercept a flow of a fluid at a clamped position;
• and
• wherein the one end portion or the other end portion has an interfering part, and when the one end portion is further pressed with the locked part being locked by the locking part, the interfering part interferes with an appropriate part and prevents further movement of the locked part.