The present invention provides a method for producing a cell aggregate containing a ciliary marginal zone-like structure, including a step of culturing a cell aggregate containing a retinal tissue in which Chx10 positive cells are present in a proportion of 20% or more of the tissue in a serum-free medium or serum-containing medium each containing a substance acting on the Wnt signal pathway for only a period before the appearance of a RPE65 gene expressing cell, followed by culturing the "cell aggregate in which a RPE65 gene expressing cell does not appear" thus obtained in a serum-free medium or serum-containing medium each not containing a substance acting on the Wnt signal pathway and so on.According to the present invention, a ciliary marginal zone-like structure can be produced with high efficiency.
