To provide a concrete form erecting method which dispenses with presetting of a purse-like fitting that is necessary, in a conventional concrete form erecting method, for mounting a retrofitted separator on a portion other than a lower portion of a sheathing board,.

The concrete form erecting method is comprised of a step of inserting and fixing a lower separator 2 into a lower portion of a gap between the two sheathing boards which are separated from each other in a mutually opposed manner; a step of inserting a reinforcement 4 into the gap between the sheathing boards and on the lower separator; a step of penetrating the rod-like retrofitted separator 13 via the sheathing boards and the reinforcement; a step of fixing slipout preventing tools 9 to the edges of the retrofitted separator so as to be butted against the inner surfaces of the sheathing boards, respectively; and a step of rigidly clamping the retrofitted separator to the sheathing boards.