Patent ID: 7271414

Claim:
A semiconductor device comprising: a transistor of a first conductivity type and a transistor of a second conductivity type, wherein said transistor of the first conductivity type includes: a first gate portion including a first gate insulating film and a first gate electrode formed on a first region of a semiconductor substrate; a first sidewall made of a first insulating film formed on a side face of said first gate portion; a first protecting film formed between said first sidewall and said first gate portion; and an extension diffusion layer of the first conductivity type formed in a portion of said first region on a side of said first gate portion, and said transistor of the second conductivity type includes: a second gate portion including a second gate insulating film and a second gate electrode formed on a second region of said semiconductor substrate; a second sidewall made of said first insulating film formed on a side face of said gate portion; a second protecting film having an L-shaped cross-section and formed between said second sidewall and said second gate portion and between said second sidewall and said semiconductor substrate; and an extension diffusion layer of the second conductivity type formed in a portion of said second region on a side of said second gate portions, wherein said first protecting film and said second protecting film are made of a second insulating film, and said first protecting film has an I-shaped cross-section.