An optical element comprising a first optical path changing element, a light control film and a second optical path changing element, which comprise each a light entrance surface and a light exit surface, in this order, wherein the first optical path changing element is configured such that the light incident on the light entrance surface at an incident angle of a first angle, which is in a range of more than -90 degrees and less than 90 degrees, is emitted at an output angle of a second angle different from the first angle, and the light incident on the light exit surface at an incident angle of the second angle is emitted at an output angle of the first angle, the light control film is configured such that the light incident on the light entrance surface or the light exit surface at an incident angle of the second angle is transmitted, and the light incident on the light entrance surface or the light exit surface at an incident angle of a third angle different from the second angle is absorbed or reflected, the second optical path changing element is configured such that the light incident on the light entrance surface at an incident angle of the second angle is emitted at an output angle of a fourth angle, and the light incident on the light exit surface at an incident angle of the fourth angle is emitted at output angles of the second angle or the third angle, the second angle and the third angle are each in a range of more than 0 degrees and less than 90 degrees, or in a range of more than -90 degrees and less than 0 degrees, the fourth angle is in a range of more than -90 degrees and less than 90 degrees, the absolute value of the difference between the first angle and the fourth angle is in a range of 0 degrees to 10 degrees, the absolute value of the sum of the second angle and the third angle is in a range of 0 degrees to 10 degrees the first optical path changing element is an inequilateral triangular prism film, the light control film is an absorptive oblique louver film, in which a plurality of absorptive louvers are formed at a tilt angle of the second angle, characterized in that the second optical path changing element is an isosceles triangular prism film, and the light incident on the light exit surface at the incident angle of the fourth angle is split, wherein a part of the light is emitted to the second angle, and the remaining part of the light is emitted to the third angle. wherein the first optical path changing element is configured such that the light incident on the light entrance surface at an incident angle of a first angle, which is in a range of more than -90 degrees and less than 90 degrees, is emitted at an output angle of a second angle different from the first angle, and the light incident on the light exit surface at an incident angle of the second angle is emitted at an output angle of the first angle, the light control film is configured such that the light incident on the light entrance surface or the light exit surface at an incident angle of the second angle is transmitted, and the light incident on the light entrance surface or the light exit surface at an incident angle of a third angle different from the second angle is absorbed or reflected, the second optical path changing element is configured such that the light incident on the light entrance surface at an incident angle of the second angle is emitted at an output angle of a fourth angle, and the light incident on the light exit surface at an incident angle of the fourth angle is emitted at output angles of the second angle or the third angle, the second angle and the third angle are each in a range of more than 0 degrees and less than 90 degrees, or in a range of more than -90 degrees and less than 0 degrees, the fourth angle is in a range of more than -90 degrees and less than 90 degrees, the absolute value of the difference between the first angle and the fourth angle is in a range of 0 degrees to 10 degrees, the absolute value of the sum of the second angle and the third angle is in a range of 0 degrees to 10 degrees the first optical path changing element is an inequilateral triangular prism film, the light control film is an absorptive oblique louver film, in which a plurality of absorptive louvers are formed at a tilt angle of the second angle, characterized in that the second optical path changing element is an isosceles triangular prism film, and the light incident on the light exit surface at the incident angle of the fourth angle is split, wherein a part of the light is emitted to the second angle, and the remaining part of the light is emitted to the third angle.