PROBLEM TO BE SOLVED: To provide a soundproof structure of a rail, which can enhance a soundproof effect by reducing not only vibrations of the rail but also noises from the rail.
SOLUTION: The covering member 8 is detachably attached to the top surface and undersurface of a bottom section R2 of the rail, and detachably attached to both side surfaces of a belly section R3 of the rail. In the covering member 8, a sound absorbing layer 9a for absorbing the noises from the rail R is provided inside, and a vibration control layer 10a for suppressing the vibrations generated on the rail R is provided outside. When the layer 9a is formed of a viscoelastic body, it constitutes a flexible spring and an attenuator (dash pot), makes the vibrations from the rail R hardly propagate from the layer 9a to the layer 10a, and converts a part of vibrational energy of the rail R into thermal energy by making viscosity bring about vibration damping, so as to absorb and damp the vibrations. Consequently, the noises, which are emitted outward from the layer 10a, are reduced.