Head of the Miyoshi clan, provincial lords of Miyoshi District in Bingo Province, based at Hiebiyamajou Castle. In 1544, when the Amago clan's Shingu Party under Amago Kunihisa invaded and Mori reinforcements were defeated at the so-called "Funo Collapse," Munetaka personally led a mere 500 men in a surprise counterattack the following day, routing the overconfident Amago army back to Izumo. He appears to have retired by 1557; his year of death is not clearly recorded.

A decisive local lord remembered for a successful surprise attack against superior numbers. Caught between the rival Mori and Amago powers in the Chugoku region, he defended his territory through his own independent military judgment.

His reversal of fortune following the "Funo Collapse" at Hiebiyamajou Castle is remembered as the episode that established the Miyoshi clan's martial reputation in the Bingo Miyoshi region.