Abstract: Proposed is a press-fit structure for sealing fastened portions while detachably fastening a first member and a second member to each other, the improved press-fit structure including: a male seal formed to protrude to a predetermined length on the first member, a female seal formed on the second member in a groove shape corresponding to the length of the male seal, and configured such that the male seal is press-fitted thereinto; and air discharge portions formed in portions of the male seal, and configured to provide discharge paths for air inside the female seal during the process of press-fitting the male seal.