After Tadayoshi ASHIKAGA reorganized the hikitsukeshu to set up naidankata(judges) in departments which exclusively handled territorial problems, naidan came to refer to a member of the naidankata, which was continued even after Tadayoshi lost his position and the hikitsukekata were restored.
足利直義が引付衆を再編して所領問題を扱う専門部局して内談方を置いて以後、内談方の構成員を指すようになり、更に直義の失脚で引付方が復活した後も継承された。