 He was given command of the destroyer from 15 December 1938 until 20 October 1939.At the start of the Pacific War, on 15 October 1941, Miyazaki was promoted to Captain and served on the staff of the IJN 5th Fleet.He subsequently was promoted to captain and served as commander of Destroyer Division 17 in the Southwest Pacific from 17 June - 18 December 1943, followed by a posting as Senior Instructor at the Torpedo School in Oppama.