PURPOSE: To inhibit generation of a concave in a ski plate and obtain constantly stable sliding performance of the ski plate by providing a reinforcing member of triangular cross section at the center portion of the inner core body of the core portion of a ski plate main body in the direction of ski width and along the longitudinal direction of the ski plate, the reinforcing member being made of material with high Young's modulus.

CONSTITUTION: An inner core material 200 having the form of the outer periphery of the core portion of a ski plate main body 1 made of a polyurethane resin of Young's modulus e.g. 0. 50 to 1.00GPa is cut at its center portion in the direction of ski width and divided into right and left portions so that a space portion 201 whose cross section is in the form of an isosceles triangle with base angle in the range 45 to 80° is formed. In the space portion 201 formed between the divided bodies 202, 203, a reinforcing member 204 made of wood with Young's modulus e.g. 10GPa is disposed along the longitudinal direction of the ski plate as a material with high Young's modulus whose cross section is in the form of an isosceles triangle almost equal to the cross section of the space portion 201, and is stuck to each of the divided bodies 202, 203 and molded.