There is provided a door hole seal installed between an inner panel 1 and a door trim 2 of an automobile door, a part of which is provided with a slit mechanism 15 through which a wire harness 3 is pulled out, wherein said slit mechanism 15 is prepared by: watertightly installing at least an upper end of a sub-seal 30 on an outer-cabin side of a main seal 20; providing a first slit 21 on said main seal 20 in a horizontal direction; and providing a second slit 31 on the sub-seal 30 at a lower position than the first slit 21 in a horizontal direction.