To form the surface of a concrete structure so that it has a feeling of consistency in all aspects and does not impair natural view.

A method of manufacturing a form panel includes a process for forming a concrete panel base 11 usable as the form of placed concrete and integrated with the placed concrete and a process for bonding wood chips 2 together by means of a binder into a planar shape to form a decorative panel 12 joined with the panel base 11. The form panel has the decorative panel 12 formed by the process. While the wood chips 2 of the decorative panel 12 exposed as the surface of the structure are decaying due to degradation or corrosion, etc., seeds of a plant E cling to the decorative panel 12 and grow naturally, covering the surface of the structure with a natural feeling to maintain natural view.