An electromagnetic shielding device, comprising: a shielding case having an accommodating space for accommodating an electromagnetic transmitting and/or receiving device, and configured to shield electromagnetic radiation transmitted from or to the electromagnetically transmitting and/or receiving device between the accommodating space and an outside of the shielding case; an internal antenna placed in the accommodating space, for transmitting electromagnetic radiation from or to the electromagnetically transmitting and/or receiving device accommodated in the accommodating space; and an antenna cable connected to the internal antenna, and guided to a portion of the shielding case so as to be connectable to an external antenna arranged outside the shielding case, wherein the shielding case includes a base having an accommodating area for accommodating the electromagnetic transmitting and/or receiving device thereon and a cover for covering the electromagnetic transmitting and/or receiving device, wherein the cover is placeable on the base such that the cover and the base surround the accommodating space in a closed state, wherein the electromagnetic shielding device further comprises an inner layer permeable for electromagnetic radiation transmitted from or to the electromagnetically transmitting and/or receiving device, wherein the inner layer is attached to an inner surface of the base facing the accommodating space in the closed state, and the internal antenna is placed between the inner layer and the base or the inner layer is attached to an inner surface of the cover facing the accommodating space in the closed state, and the internal antenna is placed between the inner layer and the cover, characterized in that the inner layer comprises at least one antenna pocket opened to the accommodating space for receiving the internal antenna. a shielding case having an accommodating space for accommodating an electromagnetic transmitting and/or receiving device, and configured to shield electromagnetic radiation transmitted from or to the electromagnetically transmitting and/or receiving device between the accommodating space and an outside of the shielding case; an internal antenna placed in the accommodating space, for transmitting electromagnetic radiation from or to the electromagnetically transmitting and/or receiving device accommodated in the accommodating space; and an antenna cable connected to the internal antenna, and guided to a portion of the shielding case so as to be connectable to an external antenna arranged outside the shielding case, wherein the shielding case includes a base having an accommodating area for accommodating the electromagnetic transmitting and/or receiving device thereon and a cover for covering the electromagnetic transmitting and/or receiving device, wherein a base having an accommodating area for accommodating the electromagnetic transmitting and/or receiving device thereon and a cover for covering the electromagnetic transmitting and/or receiving device, wherein the cover is placeable on the base such that the cover and the base surround the accommodating space in a closed state, wherein the electromagnetic shielding device further comprises an inner layer permeable for electromagnetic radiation transmitted from or to the electromagnetically transmitting and/or receiving device, wherein the inner layer is attached to an inner surface of the base facing the accommodating space in the closed state, and the internal antenna is placed between the inner layer and the base or the inner layer is attached to an inner surface of the cover facing the accommodating space in the closed state, and the internal antenna is placed between the inner layer and the cover, characterized in that the inner layer comprises at least one antenna pocket opened to the accommodating space for receiving the internal antenna.