Semiconductor device and semiconductor device manufacturing method

A manufacturing method of a semiconductor device, comprising:

• forming a first interlayer insulating film over a semiconductor substrate;
• forming, on said first interlayer insulating film, a first resist mask exposing a small-diameter part formation region where said small-diameter part is formed;
• etching said first interlayer insulating film of said small-diameter part formation region to form a first capacitor contact hole having a bottom face exposed at a first conductive member;
• removing said first resist mask;
• forming, on said first interlayer insulating film, a second resist mask exposing a large-diameter part formation region where said large-diameter part on said first interlayer insulating film is formed;
• a second etching step of etching said first interlayer insulating film of said large-diameter part formation region to form a second capacitor contact hole;
• removing said second resist mask;
• forming said contact plug by filling said first capacitor contact hole and said second capacitor contact hole with a conductive material so as to form said small-diameter part and said large-diameter part;
• providing a second interlayer insulating film on said first interlayer insulating film and said large-diameter part, and etching said second interlayer insulating film provided on said large-diameter part, thereby forming a connection hole that penetrates through said second interlayer insulating film, and has a bottom face at least part of which said large-diameter part is exposed at, an outer diameter of the bottom face of said connection hole being smaller than the outer diameter of said large-diameter part;
• and
• forming a second conductive member that uses said large diameter part exposed at the bottom face of said connection hole as a connection face to said contact plug,
• wherein:
• said first interlayer insulating film includes a plug interlayer insulating film, and a bit-line interlayer insulating film provided on said plug interlayer insulating film, and a plurality of bit-lines are formed between said plug interlayer insulating film and said bit-line interlayer insulating film;
• said first capacitor contact hole is formed between adjacent bit-lines;
• and
• an external shape of said second capacitor contact hole is formed so as to be larger than a distance between said adjacent bit-lines.