A method of manufacturing a housing-integrated board mating connector, the method comprising: preparing a housing of an electrical device, the housing having a housing insertion hole formed therein and a part or the entirety of the housing being made of a conductive metal material; inserting a cylindrical ground gasket into the housing insertion hole; preparing a dielectric part and signal terminal part assembly in which a dielectric part surrounds a signal terminal part; and inserting the dielectric part and signal terminal part assembly into an inner circumferential surface of the ground gasket, wherein in the inserting of the cylindrical ground gasket into the housing insertion hole, the ground gasket includes: a ground insertion part inserted into the housing insertion hole; a ground elastic part extending from the ground insertion part to an outside of the housing insertion hole and having three or more slits cut along a circumference thereof to have elasticity; and a ground contact part extending from the ground elastic part and being in contact with a ground electrode of a board, wherein the ground elastic part includes a first elastic portion extending outward from the ground insertion part and a second elastic portion extending inward from the first elastic portion, and the ground contact part extends obliquely in a direction from the second elastic portion toward a center of the housing insertion hole. preparing a housing of an electrical device, the housing having a housing insertion hole formed therein and a part or the entirety of the housing being made of a conductive metal material; inserting a cylindrical ground gasket into the housing insertion hole; preparing a dielectric part and signal terminal part assembly in which a dielectric part surrounds a signal terminal part; and inserting the dielectric part and signal terminal part assembly into an inner circumferential surface of the ground gasket, wherein in the inserting of the cylindrical ground gasket into the housing insertion hole, the ground gasket includes: a ground insertion part inserted into the housing insertion hole; a ground elastic part extending from the ground insertion part to an outside of the housing insertion hole and having three or more slits cut along a circumference thereof to have elasticity; and a ground contact part extending from the ground elastic part and being in contact with a ground electrode of a board, wherein the ground elastic part includes a first elastic portion extending outward from the ground insertion part and a second elastic portion extending inward from the first elastic portion, and the ground contact part extends obliquely in a direction from the second elastic portion toward a center of the housing insertion hole. a ground insertion part inserted into the housing insertion hole; a ground elastic part extending from the ground insertion part to an outside of the housing insertion hole and having three or more slits cut along a circumference thereof to have elasticity; and a ground contact part extending from the ground elastic part and being in contact with a ground electrode of a board, wherein the ground elastic part includes a first elastic portion extending outward from the ground insertion part and a second elastic portion extending inward from the first elastic portion, and the ground contact part extends obliquely in a direction from the second elastic portion toward a center of the housing insertion hole.