This paper presents the relationship between the clamped force and the values which show the nature of the dynamic characteristics of a beam containing the junction. The values are the damping ratios, effective stiffness, compliance of the resonance frequency and natural frequency of the 1st and 2nd mode with the beam. The beam with one fixed and other end free is used in the experiments. The beam is clamped by a pair of specimens with the asperity on the surface. Also, FEM is applied to estimated the values of the characteristics theoretically. Herzian theory is applied to calculate the stiffness of the roughness on the specimen. The damping ratios are calculated using the effective stiffness and the compliance of the resonance frequency as the frequency response diagram of the beam containing the junction is given approximately by superposition of a second-order system. The natural frequency and effective stiffness of the each modes increase with and the damping ratios decrease with stronger the clamped force. These theoretical values have the similar tendency and is approximately equal to the experimental one.