Ships
- IJN Kashima Captain from 3 December 1943, as additional duty while captain of Junyo · Relieved on 9 December 1943
Mitsuru Nagai was a captain in the Imperial Japanese Navy who commanded the training cruiser Kashima from 3 December 1943 to 9 December 1943.
The sources used here do not record his date or place of birth or anything about his family.
He graduated from the Naval Academy at Etajima in its 45th class.
In December 1943 he was captain of the carrier Junyo, which was in drydock at Kure. On 3 December he was also given command of Kashima, which had just come home from Truk, as additional duty for six days until a full-time captain was appointed on 9 December.
He was later promoted rear admiral.