Moreover, Nobuhiro SHIGEMATSU advocated a theory of a four-part structure, in which he asserted that the first part is from 'Kiritsubo' to 'Akashi,' the second part is from 'Miotsukushi' to 'Fuji no Uraba,' the third part is from 'Wakana' to 'Takekawa' and the fourth part is 'Ten Quires of Uji.'
この他に、重松信弘による「桐壺」から「明石」を第一部、「澪標」から「藤裏葉」までを第二部、「若菜」から「竹河」までを第三部、宇治十帖を第四部とする四部構成説がある。