Patent ID: 7947522

Claim:
A method of production of a semiconductor device which includes a first circuit region and a second circuit region each having active regions for forming elements, and in which a total area of the active regions included in the first circuit region in proportion to a whole area of the first circuit region is greater than a total area of active regions included in the second circuit region in proportion to a whole area of the second circuit region, the method of production comprising: forming a first insulating film on a whole of the first circuit region and a whole of the second circuit region which are situated on a semiconductor substrate, and forming a pattern having element isolation regions which are open and which section the active regions included in each of the first circuit region and second circuit region by selectively etching the first insulating film; forming trenches at all the element isolation regions by etching the semiconductor substrate using the first insulating film having the pattern formed therein as a mask; forming a second insulating film so as to cover the whole of the first circuit region and the whole of the second circuit region which are situated on the first insulating film having the pattern formed therein, and so as to fill inside the trenches; forming holes in the active regions which are sectioned by the element isolation regions by selectively etching the second insulating film; and removing the second insulating film, leaving the second insulating film only inside the trenches, wherein at the time of forming the holes, an interval between an outer perimeter of each of the active regions sectioned by the element isolation regions and an outer perimeter of each of the holes formed in said each of the active regions is set such that the interval in the first circuit region is smaller than the interval in the second circuit region.