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Submarines2022-present
Attack submarine
Taigei-class submarine is a attack submarine. It was built by Mitsubishi Heavy Industries Kawasaki Heavy Industries.
JapanTaigei class
Mitsubishi Heavy Industries Kawasaki Heavy Industries
Japan Maritime Self-Defense Force
Sōryū class
¥ 69.7 billion (Approx. US$ 635 million)
2018-present
2022-present
10
3
5
Attack submarine
3000 tonnes (surfaced)
84.0 m (91.9 yd)
9.1 m (29 ft 10 in)
10.4 m (34 ft 1 in)
Diesel-electric : 2 first ships: 2 × Kawasaki 25/25SB Following ships: 2 × Kawasaki 12V 25/31 Batteries : lithium-ion Propulsion: : 1 × electric motor 1 × shaft 1 × propeller
20.0 kn (37.0 km/h)
70
Systems : OYX-1 processing system ZQX-12 tactical display system Sonar suite Oki ZQQ-8 (Mitsubishi Electric) that includes: Bow-mounted sonar Flank-array sonar Fibre-optic towed-array sonar : Periscopes : Non-penetrating optical periscope (Mitsubishi Electric) ESM: NZLR-2 Surface radar ZPS-6H
Torpedoes : 6 × HU-606 533 mm (21.0 in) torpedo tubes with: Type 89 heavyweight torpedo Type 18 heavyweight torpedo Missiles : UGM-84L Harpoon Block II Future weapon : Type 12 anti-ship missiles Potential weapon : HGVP
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Reference text from Wikipedia contributors, used under CC BY-SA 4.0.
True scale
Sourced dimensions beside a 1.75 m human reference.
Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.
| Observation / report period | Value | Source | Claim state |
|---|---|---|---|
| 28 Sept 2026 | 84 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 84 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 84 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 84 m | Wikipedia contributors | approved |
Taigei-class submarine equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
JapanMaritime Self-Defense Force exact named equipment holdings: Taigei (of which 1 in trg role) (fitted with lithium-ion fuel battery). Active, operational-reserve and training units excluding equipment in store; November 2025 IISS assessment. Named service only; no parent-force or national total inferred. Source role: SUBMARINES / SSK. Original estimates, ranges, reporting names, reserve, lease and employment scopes retained; nested included counts are not added. Missile-system quantities mean launchers, not rounds. No readiness, crew, carried weapon, payload, factory-production or future order count inherited.
Maritime Self-Defense Force exact named equipment holdings of Taigei (of which 1 in trg role) (fitted with lithium-ion fuel battery). Active, operational-reserve and training units excluding equipment in store; November 2025 IISS assessment. Named service only, not a national or parent-force total or combat-readiness measure. Source role(s): SUBMARINES / SSK. No heading aggregate, carried armament, crew, payload, factory production or future order count inherited. The leading printed inventory count is retained; separately stated extra reserve, nonoperational or repair quantities inside parentheses are not added to it and remain verbatim in the excerpt. Source parentheses retain employment, lease, reporting designation, alternate model, or included-subset scopes exactly. Own fetched primary and alternate/model identity declarations are retained. Numbers inside an included subset are part of the printed count and are never added again; no sibling or parent specification is copied.