Jimyōji Junkoku served as a bushō during the Sengoku period.

Junkoku was the third son of Tsutsui Junkō, the sengoku daimyō of Yamato Province.  Although originating from the Tsutsui clan, Junkoku was based at Jimyōiji Castle in Izumi Province and appears to have been adopted by the Jimyōji family so he was then known as Jimyōiji Junkoku. 

Junkoku was the father of Tsutsui Sadatsugu and older brother of Tsutsui Junshō and Tsutsui Junsei.  Fukuzumi Toshihiro was his younger brother.  Junkoku wed the eldest daughter of Junshō so he was the uncle as well as older brother-in-law of Tsutsui Junkei.  She gave birth to Sadatsugu as her second child.  On 1/11 of Bunki 3 (1572), Sadatsugu was adopted by Junkei.  Junkoku provided a lot of support to Junkei.  In 1584, Sadatsugu succeeded Junkei following his demise.  In 1585, when Sadatsugu was ordered to transfer to Iga, Junkoku remained in Yamato and served Hashiba Hideyoshi.

It is not certain when he died, but one historical account references his participation in a war council held by the Tsutsui family after the Honnō Temple Incident – the coup d’état that resulted in the unexpected death of Oda Nobunaga, providing evidence that he lived at least until around that time.