Konica Minolta, Inc.

Takashi Nanjiyou

Masumi Nishimura

Takahiro Takagi

Masataka Takimoto

Yuki Kaneko

Yuta Shimane

The retardation film contains a cellulose ester, has a film thickness of 15 to less than 40 &#x3bc;m, has a film thickness variation both in the widthwise direction and lengthwise direction of 0 to 4 &#x3bc;m, and satisfies an Rt humidity fluctuation of 1% to 12%:(a difference of retardation(590) values in the thickness direction represented by the following formula (ii) measured at a wavelength of 590 nm after the film has been left to stand for 5 hours in each of a 23&#xb0; C., 20% relative humidity environment and a 23&#xb0; C., 80% relative humidity environment)/((590) value measured after the film has been left to stand for 5 hours in a 23&#xb0; C., 55% relative humidity environment)&#xd7;100(590)={()/2&#x2212;&#x2003;&#x2003;Formula (ii)wherein n: a refractive index in the slow axis direction in the film plane, n: a refractive index in the direction perpendicular to the slow axis in the film plane, n: a refractive index in the thickness direction of the film, and d: a film thickness.

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Tokyo, Japan

Takashi Nanjiyou