Optical laminate, a polarizing plate and an image display device

Antiglare, anti glare, it provides an optical laminate can be obtained at the same time the properties of the black reproduction, etc. Tsuyakuro feeling like. An optical laminate having an antiglare layer provided on the light transmitting substrate and the light transmitting substrate on, The antiglare layer, in which the outermost surface has an uneven shape, The optical laminate, the roughness curve of the uneven shape of the surface was measured, pull the average line to the roughness curve, take the reference length from the average line, The total number m of local peaks present in the upper portion of the average line measured in said reference in length, And Si represents the length value of between vertices of the local peaks and m-1 No. local peaks numbered m, the following formula and n representing the number of Si (I): [Number 1] To calculate the S 'is introduced into, Then, repeatedly calculated by the value of the definitive S 'to the next same reference length N times, And s'j representing the value of S 'obtained in the above equation (I), the following equation and N representing the number of S'j (II): [Number 2] Mean spacing S of local peaks that introduced was calculated is not less than 0.045 mm 0.10 mm or less, The average distance of the unevenness of the optical stack surface and Sm, the average inclination angle of the uneven portion and .theta.a, the average roughness of the unevenness in the case of the Rz, Sm is less than 100μm or 50 [mu] m, θa is equal to or less than 1.0 degrees more than 0.1 degrees, Optical laminate Rz is 0.2μm exceed 1.0μm or less.