An optical element comprising a light control film ; and first and second optical path changing elements sequentially, characterized in that the first optical path changing element is configured to emit light incident on a light entrance surface of the first optical path changing element at an incident angle of a first angle to an output angle of a second angle different from the first angle only and to emit light incident on a light exit surface of the first optical path changing element at the second angle to the first angle, the second optical path changing element is configured to emit light incident from the first optical path changing element on a light entrance surface of the second optical path changing element at an incident angle of the second angle to an output angle of the first angle only and to emit incident light incident on a light exit surface of the second optical path changing element at an incident angle of the first angle to an output angle of the second angle and a third angle only, the light control film is configured to transmit light incident from the second optical path changing element on a light entrance surface of the light control film or a light exit surface of the light control film at an incident angle of the first angle and to block light incident at angles different from the first angle, the first optical path changing element and the second optical path changing element are each a prism film in which a plurality of linear unit prism structures are formed on one surface, wherein the cross section of the unit prism structure of the first optical path changing element is an inequilateral triangle shape and the cross section of the unit prism structure of the second optical path changing element is an isosceles triangle shape, and wherein the light control film is an absorbing louver film. the first optical path changing element is configured to emit light incident on a light entrance surface of the first optical path changing element at an incident angle of a first angle to an output angle of a second angle different from the first angle only and to emit light incident on a light exit surface of the first optical path changing element at the second angle to the first angle, the second optical path changing element is configured to emit light incident from the first optical path changing element on a light entrance surface of the second optical path changing element at an incident angle of the second angle to an output angle of the first angle only and to emit incident light incident on a light exit surface of the second optical path changing element at an incident angle of the first angle to an output angle of the second angle and a third angle only, the light control film is configured to transmit light incident from the second optical path changing element on a light entrance surface of the light control film or a light exit surface of the light control film at an incident angle of the first angle and to block light incident at angles different from the first angle, the first optical path changing element and the second optical path changing element are each a prism film in which a plurality of linear unit prism structures are formed on one surface, wherein the cross section of the unit prism structure of the first optical path changing element is an inequilateral triangle shape and the cross section of the unit prism structure of the second optical path changing element is an isosceles triangle shape, and wherein the light control film is an absorbing louver film. <EOS>