Phase difference plate and method of manufacturing a retardation plate

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A phase difference plate including : a first layer which is formed from a resin having a positive intrinsic birefringence value, and has birefringence; and a second layer which is formed from a resin having a negative intrinsic birefringence value, and has birefringence, wherein a retardation Re(450) at a wavelength of 450 nm of the phase difference plate, a retardation Re(550) at a wavelength of 550 nm of the phase difference plate, and a thickness d of the phase difference plate satisfy formula (I) Re(450)/Re(550)0.0035; and production method therefor.