PURPOSE: To form a plywood having small physical and dynamic anisotropy like an oblique plywood and manufacture a plywood with thin plate thickness for the numbers of laminates by means of a network material by inserting the network material of carbon fiber or plastic of high strength or the like between plywoods and laminating in a manner that the fiber direction and mesh direction cross each other at the angles of 45° and 135°.

CONSTITUTION: A plywood 1 with its fiber direction facing sideways, a carbon fiber network material 2 with the mesh direction of two fiber directions of the plywood 1 crossing square each other at the angles of 45° and 135°, a plywood 3 with the fiber direction crossing square the plywood 1, a carbon fiber network material 4 with the mesh direction of two fiber directions crossing square the plywood 1 at the angles of 45° and 135° and a plywood 5 with the fiber direction in parallel with the plywood 1 are laminated in order successively and bonded together. The respective fiber directions said elements consisting the plywood make the angles of 0°, 45°, 90°, 135° and 180° respectively to the longitudinal direction of the plywood.