Head of the Iwaki Clan and a military commander of the Sengoku era, son of Iwaki Chikataka. His father became a vassal of the Satake Clan to inherit the position of clan head, but in compensation the third son of Satake Yoshishige was adopted into the clan as Iwaki Sadataka and heir to the clan.

In 1590, Tsunetaka participated in Toyotomi Hideyoshi's campaign against Odawara Castle and was given land as a reward, but died soon after.