Patent ID: 7105389

Claim:
A method of manufacturing a semiconductor device comprising steps of: (a) preparing an SOI substrate formed by a semiconductor substrate < 1 >, an embedded insulating layer < 2 > and an SOI layer < 3 >; (b) selectively forming on isolation film < 31 > in an upper layer part of said SOI layer while forming a first conductivity type semiconductor region < 11 , 12 > in a lower layer part of said isolation film so that said isolation film separates said SOI layer into a plurality of element forming regions and at least one said element forming region has a first conductivity type and is formed in contact with said semiconductor region among said plurality of element forming regions; (c) selectively forming a second conductivity type active region < 5 , 6 > on the surface of said at least one element forming region; and (d) forming a first conductivity type body region < 10 > capable of being externally fixed in electric potential in said SOI layer to be in contact with said semiconductor region, wherein said step (c) is carried out for forming said active region by setting a block region < 41 to 45 > including said body region and a partial region of said isolation film to a region inhibiting introduction of an impurity of said second conductivity type and introducing said impurity of said second conductivity type into said SOI layer.