A plywood laminate includes: a plate having lateral wood grains as a core plate material; additional core plate materials that sandwich the core plate material from both sides, wood grains of one of the additional core plate materials being 45° inclined and wood grains of the other one thereof being 45° inclined in an opposite direction; and, a front plate material and a rear plate material having vertical wood grains and superposed on the outside of the additional core plate materials, wherein plates constituting the plywood laminate are formed by assembling cut pieces obtained by cutting along cutting lines obtained by assembling isosceles right triangles without gap or by cutting along cutting lines obtained by assembling a pentagon of which upper portion is an isosceles right triangle and an isosceles.