Abstract: Miter joint cutting apparatus includes a base, and an adjusting member mounted on the base for relative sliding movement to a position along the direction of a saw line. A workpiece locating mechanism is mounted on the base for angular adjustment with respect to the saw line, and includes a pair of elongate guide boxes wherein each box has a lower lateral wall parallel to the base for supporting a workpiece with a forward end of the wall pivoted to the adjusting member, and a vertical wall extending from the lower wall. The lateral wall is coupled to the base via a projection which slides in a lateral slot in the base, as the guide box is moved by operation of the adjusting member.