PROBLEM TO BE SOLVED: To provide a supramolecular crystal of a chiral acid-base type complex which has a singular shape such as a shape of a nanosheet or the like with a high added value as a reaction field, and to provide a method for producing the same.SOLUTION: A chiral supramolecular crystal of an acid-base type complex is used which includes: a polymer with a straight chain-type polyethyleneimine skeleton; and a chiral saccharic acid compound being a dicarboxylic acid and provided with five or more carbon atoms. The acid-base type chiral supramolecular crystal has a singular shape such as a shape of a nanosheet or the like with a high added value as a reaction field.
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