a technique is provided for joining wood members . a plurality of slits are formed on the end portions of wood pieces desired to be joined , and the end portions are abutted with corresponding slits in alignment to form a common surface . each of the abutted wood end portions is fixed by temporary fixing means to a desired joining state . thereafter , an adhesive agent is applied into the interior surfaces of the slits . connecting plates , e . g ., made of a reinforced plastic material coated with the adhesive agent , are inserted into the aligned slits . the adhesive agent is then hardened .