A waterproof structure of a building, includes: at least two face members disposed on an exterior of the building; a sealing member disposed between end edge portions of the face members; a joint covering member disposed between the end edge portions. The end edge portions are folded to protrude exteriorly and have constrained portions for narrowing a gap therebetween. The sealing member is disposed between the end edge portions to close the gap between the end edge portions. The joint covering member covers and presses the sealing member from an exterior side. The joint covering member is attached to the constrained portions acting elastic force between the constrained portions.