The Type 90 Ship-to-Ship Missile (Japanese: 90式艦対艦誘導弾, SSM-1B) is a ship-launched anti-ship missile developed by Japan's Mitsubishi Heavy Industries. The Type-90 entered service in 1990.^[1] It is a naval version of the truck-launched Type 88 (SSM-1) missile, which in turn was developed from the air-launched Type 80 (ASM-1) missile. The Japan Maritime Self-Defense Force bought 384 of the missiles,^[1] which were fitted to their Murasame, Takanami, Atago, Akizuki, and Asahi classes of destroyers, as well as Hayabusa-class fast-attack missile boats. With a range of 150 km (81 nmi), high subsonic speed and a 260 kg (570 lb) warhead, the natively-developed Type 90 is similar to the US Harpoon missile Block-1C (RGM-84D) variant which replaced it and first installed on the 9 Murasame-class destroyers that started series production in 1994.

Type 90 Ship-to-Ship Missile, SSM-1B
Type-90 canistered launchers, starboard of JS Fuyuzuki DD-118 (4th Akizuki-class destroyer) at Maizuru Naval Base in 2014 July 27.
Type	Anti-ship cruise missile
Place of origin	Japan
Service history
In service	1990[1]
Used by	Japan Maritime Self-Defense Force
Production history
Manufacturer	Mitsubishi Heavy Industries
No. built	>384[1]
Specifications
Mass	661 kg (1,457 lb)[1]
Length	5.08 m (16.7 ft)[1]
Diameter	350 mm (13.8 in)[1]
Wingspan	1.2 m (3.9 ft)[1]
Warhead	high explosive
Warhead weight	260 kg (570 lb)[1]
Engine	TJM2 turbojet + 1 solid rocket booster[1]
Operational range	150–200 km (81–108 nmi)
Flight altitude	5-6m
Maximum speed	1,150 km/h (715 mph)
Guidance system	Inertial guidance and terminal active radar homing
Launch platform	Asahi, Akizuki, Atago, Takanami, Murasame destroyer classes; Hayabusa-class missile boats