Abstract: The present invention relates to a clamping device for semipermanently fixing a part, such as a fluid conveying hose, dustproof bellows, axial boot or the like, on the circumferential surface of an desired mating device. According to this invention, even if such part looses its elasticity owing to aging, the clamping device maintains the permanent stable firm clamping state. For this purpose, the inner and outer overlap portions (11a, 110a; 11b, 110b) of the clamp band (11, 110) made of metal strip material (M) are forced by an operating tool to close until the seizing tooth (16a, 160a) of the inner overlap portion (11a, 110a) and the fixed tooth (22b, 220b) of the outer overlap portion (11b, 110b) seize each other, thereby contracting the bore diameter of the clamp band (11, 110).