PURPOSE: To obtain planned smoothness, strength, rigidity and reduce weight by providing a cloth-like composite material, in a state that it abuts against a honeycomb lip, between one-way fiber reinforced resin composite material and honeycomb core.

CONSTITUTION: A one-way fiber reinforced resin composite material 3 has parts where fibers run in a direction along a honeycomb lip 6 of a honeycomb core 4 at some parts, while a woven cloth or unwoven cloth 8 intersects the honeycomb 6 of the honeycomb core 4, adjacent fibers are entangled with each other without separating from each other. Even when pressure is exerted on the honeycomb core 4 and the one-way fiber reinforced resin composite material 3 relatively at heat and pressure molding process, they are maintained by the woven cloth or the unwoven cloth 8 and the fiber parts of the one-way fiber reinforced resin composite material 3 along the honeycomb lip 6 also do not escape due to the push of the honeycomb lip 6.