The present invention provides a manufacturing method for retardation plate with optical compensation function for flexible use which does not cause problems such as wrinkles and cracks even when being bended, and does not reflect outside light in a colored state even when being folded. The manufacturing method of the present invention forms a horizontal alignment film, a horizontal alignment liquid crystal cured film, a vertical alignment film, and a vertical alignment liquid crystal cured film in this order to manufacture a retardation plate with optical compensation function for flexible display; wherein, the horizontal alignment film is formed via coating, drying, and alignment treatment steps; the horizontal alignment liquid crystal cured film is formed via coating, drying and ultraviolet irradiation steps, after forming the horizontal alignment film; further, the vertical alignment film is formed via a coating, drying step; and the vertical alignment liquid crystal cured film is formed via a coating, drying, and ultraviolet irradiation steps.