A vulnerability finding device has a vulnerability extracting unit, a normalization processing unit, and a matching unit. The vulnerability extracting unit extracts a first program code corresponding to a vulnerable part of software. The normalization processing unit performs normalization of a parameter included in the first program code extracted by the vulnerability extracting unit and a second program code of software to be inspected for a vulnerable part. The matching unit performs matching between the first program code after the normalization and the second program code after the normalization, and detects a program code, which is a program code that is the same as or similar to the first program code, from the second program code.