PURPOSE: To enable the construction of concrete building frames such as wall, column, beam and slab with the work for continuously connecting standardized frames without carpenters, and to facilitates the work for mold-releasing the frame structure, which specify the slab or the lower surface of the ceiling.

CONSTITUTION: A slab supporting wood panel 9 is provided on each upper flange 5...5 of a frame group 3...3 for specifying wall, column and beam, and the wood panel 9 is supported on plural sleepers 7$7 supported on multiple supports. The peripheral outline of the panel 9 is formed smaller than the peripheral outline of the upper flange 5, and an L-shape plate, which abuts on the upper flange 5 and the top surface of the panel 9, is provided so as to construct the frame structure formed with a space. Thereafter, ready-mixed concrete is placed.