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ArtilleryIn service
Self-propelled howitzer
Type 99 155 mm self-propelled howitzer is a self-propelled howitzer originating in Japan. It was built by Mitsubishi Heavy Industries (hull), Japan Steel Works (gun, turret).
JapanType 99 155 mm self-propelled howitzer
Rikujojieitai Boueisho · CC BY-SA 3.0 · Resized · CC BY-SA 3.0 · Source ↗ · ModifiedSelf-propelled howitzer
Japan
1999 –…
see Operators
Technical Research and Development Institute
1994–1999
Mitsubishi Heavy Industries (hull), Japan Steel Works (gun, turret)
960 million yen
1999–2022
136
40 t (39 long tons; 44 short tons)
11.3 m (37 ft) (gun front)
3.2 m (10 ft)
4.3 m (14 ft)
4
155 mm (6.1 in)
360°
6 rpm
30 km (19 mi) (standard) 40 km (25 mi) ( base bleed )
aluminium
155 mm /L52 howitzer gun
12.7 mm M2 Browning machine gun
Mitsubishi 6SY31WA 4-stroke I6 liquid-cooled diesel 600 hp (450 kW)
15 hp/t
torsion bar
300 km (190 mi)
49.6 km/h (30.8 mph)
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| 28 Sept 2026 | 155 mm | Wikipedia contributors | superseded |
| 28 Sept 2026 | 155 mm | Wikipedia contributors | approved |
Type 99 155 mm self-propelled howitzer equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
JapanGround Self-Defense Force exact named equipment holdings: Type-99. 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: ARTILLERY / SP 155mm. 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.
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