PURPOSE: To enhance the support force of an inner form frame during construction of a compound building made of concrete and wood.

CONSTITUTION: A sill 6 is set on a footing 5, and an inner form frame 7 is planted. A beam 8 is fixed to the upper end of the inner form frame 7, and a slab form frame 9 is fixed on the beam 8. Further, the frame 1 is fixed to the outer surface of the inner from frame 7, and then reinforcement is arranged around the frame 1 before an outer form frame 13 is planted. A coupling part 1a provided to the frame 1 is set on a slab form frame 9, and a sill 6 and a a stab form frame 9 for an upper story are set in the upper part of the coupling part 1a. The above-mentioned steps are repeated until a desired number of stories are build up. Further, concrete is placed between the inner form frame 7 and the outer form frame 13 and on the slab form frame 9 so as to form a wall and a slab. Further, the slab and the wall are coupled together by means of the coupling members 1a of the frames 1, and the frames 1 and the inner form frame 7 are also integrally coupled together so as to exhibit a firm support force.