An electromagnetic shielding gasket for contacting first and second opposing walls (102a, 102d) of subcasings of an electronic device body, wherein the subcasings are disposed to each other across a gap, the electromagnetic shielding gasket comprising: a fitting part having a width approximately the same or smaller than a width of a gasket holding hole formed in the first opposing wall to penetrate from an outer wall surface to an inner wall surface of the first opposing wall, the fitting part being fitted in the gasket holding hole in sliding motion from a longitudinal end side of the gasket holding hole; a gasket body connected to the fitting part, the gasket body being brought into contact with the outer surface of the first opposing wall and with the second opposing wall, the gasket body comprising a supporting member; and a stopping part connected to the fitting part and disposed on the inner wall surface side of the first opposing wall, the stopping part comprising: a first lug projecting in a width direction of the fitting part from a first end face in the width direction of the fitting part; and a second lug projecting in the width direction of the fitting part from a second end face in the width direction of the fitting part, the first and second lugs constituting to keep at least one of a first distance from the second end face to a projecting tip of the first lug and a second distance from the first end face to a projecting tip of the second lug greater than the width of the gasket holding hole even when the first or second lug (31, 32) is deformed under external forces, wherein the first and second lug (31, 32) are projecting to opposite sides from the fitting part, characterized in that the first and second lug (31, 32) comprise third and fourth contacting parts (31a, 32a), respectively, which are positioned opposite to first and second contacting parts (24, 25), respectively, being arranged on the supporting member of the gasket body, wherein the distance between the third and fourth contacting parts (31a, 32a) and the first and second contacting parts (24, 25), respectively, is nearly the same as the thickness of the first opposing wall. a fitting part having a width approximately the same or smaller than a width of a gasket holding hole formed in the first opposing wall to penetrate from an outer wall surface to an inner wall surface of the first opposing wall, the fitting part being fitted in the gasket holding hole in sliding motion from a longitudinal end side of the gasket holding hole; a gasket body connected to the fitting part, the gasket body being brought into contact with the outer surface of the first opposing wall and with the second opposing wall, the gasket body comprising a supporting member; and a stopping part connected to the fitting part and disposed on the inner wall surface side of the first opposing wall, the stopping part comprising: a first lug projecting in a width direction of the fitting part from a first end face in the width direction of the fitting part; and a first lug projecting in a width direction of the fitting part from a first end face in the width direction of the fitting part; and a second lug projecting in the width direction of the fitting part from a second end face in the width direction of the fitting part, the first and second lugs constituting to keep at least one of a first distance from the second end face to a projecting tip of the first lug and a second distance from the first end face to a projecting tip of the second lug greater than the width of the gasket holding hole even when the first or second lug (31, 32) is deformed under external forces, wherein the first and second lug (31, 32) are projecting to opposite sides from the fitting part, characterized in that the first and second lug (31, 32) comprise third and fourth contacting parts (31a, 32a), respectively, which are positioned opposite to first and second contacting parts (24, 25), respectively, being arranged on the supporting member of the gasket body, wherein the distance between the third and fourth contacting parts (31a, 32a) and the first and second contacting parts (24, 25), respectively, is nearly the same as the thickness of the first opposing wall.