In 974, during the reign of Emperor Enyu, Korechika was born between Hyoe no suke (the assistant captain of the headquarters of the Middle Palace Guard) FUJIWARA no Michitaka, a legitimate son of Shokei (court noble who work at the Imperial Court in a high-ranking post) Dainagon (chief councilor of state) FUJIWARA no Kaneie from the Sekkan (regents and advisers) family line of the Northern House of the Fujiwara clan and TAKASHINA no Takako, who was a daughter of TAKASHINA no Naritada and served as naishi (lady-in-waiting) at dairi (Imperial Palace).
天延2年（974年）、円融天皇代、藤原北家摂関流の上卿大納言藤原兼家の嫡男・兵衛佐藤原道隆と、内裏の内侍であった高階成忠女高階貴子の間に生まれる。