PURPOSE: To improve safety and workability of removing a form after a building frame is formed in a constructing method of concrete building frame for a house capable of repeated use and of assembling easily when an unexperienced person connects the form.

CONSTITUTION: A continuous footing is layed on a floor concrete 1 or slab 3 by connecting first forms 15, 16 having a height H and second forms 22, 23 of which height is about 50mm to each other with the latter set on the former. After it is hardened, the second frame is removed to expose the upper part of the footing. Then, flanges 27, 28 for connecting third forms 25, 26 onto flanges 17, 18 for connecting the first forms with bolts/nuts 24 are interposed to have a space. Thereafter, concrete is applied onto the third forms 25, 26 and concrete body integrated with the footing is formed. When the forms are removed, the third forms 25, 26 are pulled down strongly with operation of the bolts/nuts so that the forms are separated from the concrete, thereby attaining easy removal.