His father was Ikeda Nobumasa and his mother was Miyoshi Masanaga's daughter, both dominant kokujin. In 1548, Nobumasa betrayed Hosokawa Harumoto. He was defeated, and as a result was forced to commit suicide. Nagamasa succeeded to headship of the house on his father's death, ruling the whole of Settsu Province. He became a retainer of Miyoshi Nagayoshi following his defeat at Nagayoshi's hands. He subsequently fought against Yasumi Naomasa as a retainer of the Miyoshi clan.
- History Orb Year 1563 Accessed May 8, 2011
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