PURPOSE: To use a cedar material which is easily available in Japan, in particular, as a high grade beam member, by enhancing the strength of the cedar material with the use of reinforcement.

CONSTITUTION: A plurality of conifer plate materials 1 are stacked so as to form a laminated member, and one of more of reinforcing steel bars 2 are inserted longitudinally between joined surfaces on the tension side and the compression side which are exhibited when a load is exerted perpendicularly to the longitudinal direction of the laminated member. Alternatively, a plurality of conifer plate materials 1 are stacked one upon another so as to form a laminated member, and one or more of reinforcing steel bars 2 are inserted longitudinally, between the joint surfaces on the tension side or the compression side which are exhibited when a load is exerted perpendicularly to the longitudinal direction of the laminated member. Inserted of the steel reinforcing bars, carbon wires or steel plates can be used.