A saw jig in which a guide member (10) is clamped onto a board to be cut. The guide member has a slot (14) for guiding the saw blade for travel in a straight line. The guide member is clamped by means of clamping bolts and nuts onto a board to be cut and the corners of the slot (14) make contact with the surface of the board on order to prevent the board form chipping. The board is cut while lying in a near vertical position so that the cut woood does not place undue strain on the jig and does not separate before the cut has been completed.