Lifespan: Eiroku 10 (1567) to Tenshō 15 (1587)
Clan: Chōsokabe → Kagawa
Lord: Chōsokabe Motochika
Father: Chōsokabe Motochika
Adoptive Father: Kagawa Yukikage
Siblings: Chōsokabe Nobuchika, Chikakazu, Tsuno Chikatada, Chōsokabe Morichika, Chōsokabe Ukon-Taifu, Chōsokabe Yasutoyo
Wife: [Formal] Daughter of Kagawa Yukikage
Kagawa Chikakazu served as a bushō during the Azuchi-Momoyama period.
In 1567, Chikakazu was born as the second son of Chōsokabe Motochika, the twenty-first head of the Chōsokabe clan and sengoku daimyō of Tosa Province.
In 1578, his father, Motochika, invaded Sanuki Province. In 1581, as a condition of settlement, Motochika sent Chikakazu to be adopted by Kagawa Yukikage (Nobukage), the deputy military governor of four districts in western Sanuki. As the designated heir, Chikakazu then acquired the surname of the Kagawa clan. At this time, he adopted the name of Kagawa Gorō-jirō. The name of Gorō-jirō had distinctive characters used in the names of others belonging to the main branch of the Kagawa clan.
Chikakazu led Kagawa forces in various battles in the central districts of Sanuki, contributing to the subjugation of the province. He also succeeded in deepening the alliance with Kaneko Motoie of eastern Iyo Province.
In 1583, around the time that Sanuki was almost completely pacified, he entered Amagiri Castle. The Chōsokabe clan used this castle as a base from which to invade Iyo, and aimed to govern the kokujin, or provincial landowners, of Sanuki and eastern Iyo.
In 1585, the Invasion of Shikoku by Toyotomi Hideyoshi led to the surrender of the Chōsokabe clan. The Kagawa clan was removed from their position while Chikakazu was sent as a hostage to Yamato-Kōriyama. In 1586, he returned to Okō in Tosa. Chikakazu was allocated landholdings in the township of Yamada in the Hata District.
Chikakazu resided, along with other retainers including Nakama Tōzaemon and Yamachi Toshian, in a dwelling in the village of Higashi-ono below Okō Castle. That same year, his older brother, Chōsokabe Nobuchika, was killed in action at the Battle of Hetsugigawa so Toyotomi Hideyoshi sent a sealed letter to Motochika seeking to have Chikakazu become the successor to the family but Motochika disagreed and, instead, decided to have his cherished fourth son, Chōsokabe Morichika, become the designated successor to the family.
Before long, Chikakazu fell ill and, in 1587, died below Okō Castle. Concerning the cause of his death, various theories include that he became ill owing to stress with regard to family succession, that he died from fasting owing to despair that there was no possibility of succession, that he fasted out of consideration to the main branch of the Chōsokabe family, or that he was poisoned by his father. His was buried at the ancestral grave below a small gravestone in the foothills of Mount Okō.