To acquire a cheap bending method which prevents inside and outside flaps from interfering in attaching a bending crease outside for a conventional inner flap as for one place from two places, but bending is possible, placement by a tight space from a box element to assembling is possible and which does not act a cylinder etc. for bending.

An inside and outside flap interference preventing method at the time of box assembling comprises an accumulated box element, and a resistance member to which inside and outside flap portions of couple of the above-mentioned box element lower section is pushed on from the inside flap, and the outside flap attaches a bending angle outwards when one sheet of the box element is pulled out by a suction plate, etc., and the step of composing to prevent the inside and outside flap interference in box assembling so that it may be in the state that the inner flap is settled inside when the above-mentioned box element is opened. Thereby, interference and failure of the inside and outside flaps are lost.

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