Isamu Tanonaka (田の中勇, Tanonaka Isamu?), born July 19, 1932 in Tokyo, is a veteran seiyū. He is currnetly represented by Aoni Production.

He is most known for voicing the character Medama Oyaji (Daddy Eyeball) in all 5 GeGeGe no Kitarou anime, as well as Sindbook in the original Magical Princess Minky Momo.

Source: Wikipedia