PURPOSE: To improve bonding strength and follow-up performance to a base body, by setting a polyurethane resin layer including the grain plastics of the diameter of 0.4mm or larger, on the base body, and by setting a fiber reinforced thermosetting resin layer 13 on the polyurethane resin layer.

CONSTITUTION: On a base body 9 a polyurethane resin layer 11 is set via a primer 10, and on the layer 11, a fiber reinforced thermosetting resin layer 13 is set. The polyurethane resin layer 11 includes the grain plastics 2 of the diameter of 0.4mm or larger. As a result, the layer bonding strength of the polyurethane resin layer 11 and the fiber reinforced thermosetting resin layer 13 is improved, and the performance of followed-up to the crack of the base body 9 is improved.