The purpose of this paper is to clarify the damping characteristics of adhesively bonded structures and to establish a method to estimate the damping capacity. As a fundamental study, the damping characteristics of a beam in which two steel strips are partially joined by an adhesive are investigated. Analytically, strain energy distributions are analyzed by a finite element analysis. Then, the damping capacity of the adhesively bonded beam is estimated using the strain energies and damping ratios of the two materials which are obtained independently by experiment. The validity of the proposed estimation method of the damping capacity is confirmed by experiment. The analytical results are in fairly good agreement with the experimental ones. Furthermore, the temperature dependency of the damping capacity is examined.