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PROBLEM TO BE SOLVED : To provide an optical film which can realize a high contrast ratio over a wide wavelength range and controlled color shift, to provide its production method, and to provide an optical compensation film, a polarizing plate, and a liquid crystal display device using the same. SOLUTION : What is provided is : an optical film having retardations satisfying the formulae (1) to (4) and made through a wet stretch process; its production method; and an optical compensation film, a polarizing plate, and a liquid crystal display device using the same. (1) 0.1COPYRIGHT : (C)2007, JPO&INPIT