Glulam specimens with a large section were tested to find the effect of the processing accuracy of joints on the strength of bonded joints experimentally, furthermore bending tests were carried out with the full scale glulam specimens in order to investigate the bending strength of bonded joints. As a result, the following conclusions were obtained. Bending strength of the bonded joint is substantially subject to the processing accuracy of the joint part, and full strength connection of glulam with a large section will be feasible by big finger joint or scarf joint made under sufficient accuracy control.