To provide a finger joint method of high productivity, even in the case of a micro finger with a shorter finger length, by which the joint part does not shift or slip off even if the joint is released from pressing and the material is moved in the state of an adhesive being uncured once after the fingers are combined one another , pressed and fixed after processing the fingers and applying the adhesive to them.

The edge lines of a tooth-shaped finger cutter 40a and 40b have a taper θT against a rotating axis. The finger is processed by cutting in the state of keeping the finger cutter 40a and 40b inclined only by nearly the same angle θT as of the taper θT in the direction of the lamina perpendicular to the forwarding direction at the time of processing the lamina end surface. When the laminas 1 whose fingers have been processed are coupled one another after applying the adhesive, the fingers are combined by relatively moving the two laminas toward the inclined direction including the component of the thickness direction of the lamina 1 in the state of nearly keeping the parallelism of the two laminas 1.