To provide a hybrid board capable of forming a highly earthquake- resistive aseismatic wall or aseismatic floor.

A thin steel sheet 5 is stuck on one surface 3a of a plywood for structure 3 with a resin adhesive to form a hybrid board 1. The hybrid board 1 is brought into contact with a square pipe 51 forming a metal framework through the thin steel sheet 5, and fixed by driving a nail 71 therein to form an aseismatic structure. In this aseismatic structure, a shearing force acts on the hybrid board 1 and the metal framework along the surface of a surface material and, therefore, the force of the nail 71 on the hybrid board 1 is received by a high strength thin steel sheet 5. As a result, a high aseismatic property can be held since there is no biting of the nail 71 as is present in a wooden plywood for structure.