PURPOSE: To provide the working method of a veneer, by which no problem on the manufacture of a board material even made of veneers developing twisting by drying in normal working method occurs.

CONSTITUTION: Under the condition that a nose bar 3 is provided at the position, at which log 2 is compressed in the direction of the thickness of veneer 5 by 10% of the set veneer thickness, the veneer 5 is cut with a cutter 4 in order to form notched parts at the edge face of one of veneers 5 to be bonded to each other, resulting in providing first tongued and grooved part 5a, which is uneven in the direction of the thickness of veneer. Further, notched parts are formed at the edge face of the other veneer to be bonded to each other, resulting in providing second tongued and grooved part 5b having the shape engaging with that of the first tongued and grooved part 5a. Thus, one and the other veneers are bonded together by engaging with the tongued and grooved parts 5a and 5b with each other.