Joint unit

To provide an antireflection film which hardly causes the degradation of contrast according to a change of viewing angle, reversal of gradation or black and white, hue change and the like and has improved color irregularity and improved scratch resistance, and to provide a manufacturing method of the antireflection film.The antireflection film has a light-diffusing layer and a low refractive index layer on a transparent support, wherein the light-diffusing layer has an inner haze value of 30 to 60% and a surface haze value of 1% or less, and the antireflection film has an average reflectance of 2.5% or less at a wavelength of 450 nm to 650 nm. In the manufacturing method of the antireflection film, a coating device is used, wherein a top end lip 17 on the opposite side to the traveling direction of a web W and the web W are disposed so that a clearance between both becomes larger by >=30[mu]m and =30[mu]m and