Patent ID: 8101516

Claim:
A pattern formation method of forming a first hole and a second hole having different depths in an insulating layer formed on a semiconductor substrate, the method comprising: forming a block film on a region which includes a region of the insulating layer where the first hole is to be formed, and in which the second hole is not to be formed; forming a resist film having openings for forming the first hole and the second hole, on the block film and the insulating layer; and performing etching by using the resist film as a mask, thereby forming the first hole in the block film and the insulating layer, and the second hole in the insulating layer, a depth of the first hole from an upper surface of the insulating layer being smaller than that of the second hole such that the first hole does not reach the semiconductor substrate; and forming an antireflection coating on the block film and the insulating layer, wherein performing the etching using the resist film as a mask is terminated when a bottom surface of the second hole has reached an impurity diffusion layer formed in the semiconductor substrate, and wherein the resist film for forming the first hole and the second hole is formed on the antireflection coating.