A method of producing an optical display device having a rectangular optical display unit with a long side and a short side, a first optical film having a first polarizing plate (F11a) bonded to one surface of the optical display unit, and a second optical film having a second polarizing plate (F21a) bonded to the other surface of the optical display unit, the method comprising: providing a material roll set comprising a first material roll and a second material roll, wherein the first material roll includes a wound up first long sheet material in which the first optical film including the first polarizing plate (F11a) having its absorption axis parallel to the long direction of the first material roll, a first pressure-sensitive adhesive layer and a first release film are laminated in this order, and the first long sheet material has a width equal to the short side of the optical display unit, and the second material roll includes a wound up second long sheet material in which the second optical film including the second polarizing plate (F21a) having its absorption axis parallel to the long direction of the second material roll, a second pressure-sensitive adhesive layer and a second release film are laminated in this order, and the second long sheet material has a width equal to the long side of the optical display unit; a first cutting and bonding step of cutting the first optical film in the first long sheet material at a length equal to the long side of the optical display unit, releasing the first release film, and thereafter bonding the first optical film to one surface of the optical display unit using the first pressure-sensitive adhesive layer; and a second cutting and bonding step of cutting the second optical film in the second long sheet material at a length equal to the short side of the optical display unit, releasing the second release film, and thereafter bonding the second optical film to the other surface of the optical display unit using the second pressure-sensitive adhesive layer, and a turning step of turning the optical display unit between the first cutting and bonding step and the second cutting and bonding step, characterised in that means either a turning step of turning the optical display unit after being bonded by the first cutting and bonding step to an orientation during the second cutting and bonding step where the long side of the optical display unit (W 1) is orthogonal to the flow direction of the optical display unit, or a turning step of turning the optical display unit after being bonded by the second cutting and bonding step to an orientation during the first cutting and bonding step where the long side of the optical display unit (W 1) is parallel to the flow direction the optical display unit, wherein the line direction of the first optical film is parallel to or collinear with the line direction of the second optical film. providing a material roll set comprising a first material roll and a second material roll, wherein the first material roll includes a wound up first long sheet material in which the first optical film including the first polarizing plate (F11a) having its absorption axis parallel to the long direction of the first material roll, a first pressure-sensitive adhesive layer and a first release film are laminated in this order, and the first long sheet material has a width equal to the short side of the optical display unit, and the second material roll includes a wound up second long sheet material in which the second optical film including the second polarizing plate (F21a) having its absorption axis parallel to the long direction of the second material roll, a second pressure-sensitive adhesive layer and a second release film are laminated in this order, and the second long sheet material has a width equal to the long side of the optical display unit; a first cutting and bonding step of cutting the first optical film in the first long sheet material at a length equal to the long side of the optical display unit, releasing the first release film, and thereafter bonding the first optical film to one surface of the optical display unit using the first pressure-sensitive adhesive layer; and a second cutting and bonding step of cutting the second optical film in the second long sheet material at a length equal to the short side of the optical display unit, releasing the second release film, and thereafter bonding the second optical film to the other surface of the optical display unit using the second pressure-sensitive adhesive layer, and a turning step of turning the optical display unit between the first cutting and bonding step and the second cutting and bonding step, characterised in that means either a turning step of turning the optical display unit after being bonded by the first cutting and bonding step to an orientation during the second cutting and bonding step where the long side of the optical display unit (W 1) is orthogonal to the flow direction of the optical display unit, or a turning step of turning the optical display unit after being bonded by the second cutting and bonding step to an orientation during the first cutting and bonding step where the long side of the optical display unit (W 1) is parallel to the flow direction the optical display unit, wherein the line direction of the first optical film is parallel to or collinear with the line direction of the second optical film.