PROBLEM TO BE SOLVED: To provide a louver film with which, when being installed at a light-transmissive window, ghost images as viewing objects, viewed through the light-transmissive window become invisible, that cannot prevent transmission of light entering from a specific direction to the light-transmissive window, and that can prevent the transmission of light entering from parts other than the specific direction to the light-transmissive window.SOLUTION: [1] A louver film 1 including a louver layer 10 in which light transmission bands 11 and light shielding bands 12 are alternately arranged, the louver film 1 is characterized in that a pitch of the light shielding bands 12 is not less than 300 μm and not more than 1100 μm. [2] The louver film as set forth in [1] is characterized in that an aperture ratio represented by {the width of the light transmission band/((the width of the light transmission band)+(the width of the light shielding band))}×100%, is not less than 90% and not more than 99.9%. [3] The louver film as set forth in [1] or [2] is characterized in that the thickness of the louver layer 10 is not less than 350 μm and not more than 3000 μm.SELECTED DRAWING: Figure 1
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