To provide a circularly polarizing plate having a novel configuration, an optical laminate comprising the same, and an image display device.SOLUTION: A circularly polarizing plate is provided, comprising a linearly polarizing plate and a cured liquid crystal layer, the linearly polarizing plate comprising a polarizer and a protective film laminated only on one surface of the polarizer, where the polarizer, the protective film, and the cured liquid crystal layer are arranged in the described order. An optical laminate comprising the same, and an image display device are also provided.SELECTED DRAWING: Figure 1

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