To provide a wood processing apparatus continuously performing a next processing with wood placed on a band sawing machine carriage.

By installing the ascending-descending processing machine 5, halving processing of a lumber 2 and planer processing of a heavy structural material can be performed, while the lumber 2 is placed on the carriage 1 in a state of performing lumbering work, a circular saw is mounted on a vertical main spindle of the ascending-descending processing machine 5 and horizontally rotated, and the planer processing can be performed while placing the lumber on the carriage after re-lumbering for removing twist and distortion by a barrel of the main spindle. Thus, the labor cost, physical burden to a worker and accident occurrence can be reduced.