A lighting system comprising a wall structure and a lighting apparatus, the wall structure comprising: an installation surface on which a lighting apparatus is to be installed; a first conductive attachment part provided at the installation surface to be attached to the lighting apparatus, the first conductive attachment part electrically connected with a first terminal of a power source to supply power to the lighting apparatus; and a second conductive attachment part provided at the installation surface to be attached to the lighting apparatus, the second conductive attachment part spaced apart from the first conductive attachment part, the second conductive attachment electrically connected with a second terminal of the power source, wherein the lighting apparatus comprises a lighting part and a housing part to accommodate the lighting part; and the housing part comprises: a first housing part attached to the first conductive attachment part, the first housing part formed of a conductive material, the first housing part electrically connected with the lighting part; a second housing part attached to the second conductive attachment part, the second housing part formed of the conductive material, the second housing part to be electrically connected with the lighting part; characterized in that the lighting part has a board on which at least one light element is mounted; and the lighting apparatus comprises an insulation part disposed between the first and second housing parts (121, 123) to insulate the first and second housing part (121, 123) from each other, and coupled with each of the first and second housing parts (121, 123), wherein coupling grooves are formed at each of the first and second housing parts (121, 123) in a lengthwise direction of the first and second housing parts (121, 123), coupling protrusions are formed at both sides of the insulation part in a lengthwise direction of the insulation part, and the coupling protrusions are inserted and coupled into the coupling grooves of the first and second housing parts (121, 123). an installation surface on which a lighting apparatus is to be installed; a first conductive attachment part provided at the installation surface to be attached to the lighting apparatus, the first conductive attachment part electrically connected with a first terminal of a power source to supply power to the lighting apparatus; and a second conductive attachment part provided at the installation surface to be attached to the lighting apparatus, the second conductive attachment part spaced apart from the first conductive attachment part, the second conductive attachment electrically connected with a second terminal of the power source, wherein the lighting apparatus comprises a lighting part and a housing part to accommodate the lighting part; and the housing part comprises: a first housing part attached to the first conductive attachment part, the first housing part formed of a conductive material, the first housing part electrically connected with the lighting part; a second housing part attached to the second conductive attachment part, the second housing part formed of the conductive material, the second housing part to be electrically connected with the lighting part; a first housing part attached to the first conductive attachment part, the first housing part formed of a conductive material, the first housing part electrically connected with the lighting part; a second housing part attached to the second conductive attachment part, the second housing part formed of the conductive material, the second housing part to be electrically connected with the lighting part; characterized in that the lighting part has a board on which at least one light element is mounted; and the lighting apparatus comprises an insulation part disposed between the first and second housing parts (121, 123) to insulate the first and second housing part (121, 123) from each other, and coupled with each of the first and second housing parts (121, 123), wherein coupling grooves are formed at each of the first and second housing parts (121, 123) in a lengthwise direction of the first and second housing parts (121, 123), coupling protrusions are formed at both sides of the insulation part in a lengthwise direction of the insulation part, and the coupling protrusions are inserted and coupled into the coupling grooves of the first and second housing parts (121, 123).