To provide a bearer contact force evaluating device capable of singly evaluating the effects of a contact force acting on the inside of a transmission path on attenuation.

The bearer contact force evaluating device is constituted of an electric circuit part A to generate and receive electric signals and a probe part B to perform bidirectional conversion between the electric signals and surface waves 10. In the probe part B, a probe main body 13 is formed in a circular shape to match the surface shape of a roller and is installed to the surface of a bearer 1 and supported. The surface waves 10 are generated by an oscillating part 8 and a transmitter 9. The surface waves 10 pass through a roll contact part (the contact part between the bearer 1 and a bearer 1') on which a contact force 5 is acting and then are measured at a receiver 11 and receiving part 12. As surface waves have directivity, and most of their energy is characteristically transmitted through a region down to a depth approximately half wavelength from the surface, it is possible to evaluate the effects of the contact force acting on the inside of a transmission path on sound pressure attenuation.