To provide a rubber-coated material having a novel structure capable of imparting an indicator for a residual thickness while securing durability.

An indicating hole 84, which opens into a rear face on the side of an abutting member 10, is defined in a depth that does not reach a surface of the abutting member 10, against which another member is made to abut, with respect to a rubber-coated material 38 covering the abutting face of another member against the abutting member 10. An indicating material 80 having a different color is coupled into the indicating hole 84 in a packed state.