Ōnami was laid down at IHI Corporation Kobe Shipyard on 20 March 1959 and launched on 13 February 1960.

[1] On 31 August 1960, she was transferred to the 11th Escort Corps, which was newly formed under the Kure District Force, together with JDS Takanami.

[citation needed] On 1 December 1977, the 11th Escort Corps was reorganized under the Sasebo District Force.

[citation needed] In 1980, the short torpedo launcher was removed, and anti-submarine attack capability enhancement work was carried out to equip two 68-type triple short torpedo launchers.

She was transferred to the Sasebo District Force as a ship under direct control.