Icon-w.png This article is about a/an transformation device in Kamen Rider W.

"Cyclone/Heat/Luna, Joker/Metal/Trigger (music to music)"
―Transformation announcement with Double's Gaia Memory[src]

"(Memory) Maximum Drive!"
―Maximum Slot Finisher announcement[src]

The Transformation Belt Double Driver (変身ベルト ダブルドライバー Henshin Beruto Daburu Doraibā) is Kamen Rider Double's transformation belt, a second generation Memory Driver developed for the user to link with Philip to access his abilities, and the successor of the Lost Driver in terms of belt design. Unlike earlier models, the Double Driver uses two specialized Gaia Memories at once for even more power for the user. There is only one physical Double Driver, but when Shotaro places it on him, another Double Driver manifests itself onto Philip.


The Double Driver was inherently based on the Lost Driver and was the third to be built in the series. However unlike the Gaia Driver, the Lost Driver and the Accel Driver, which all only have one Memory Slot, the Double Driver has two Memory Slots that allow two clear Gaia Memories to be inserted and give the user more power. It was also later shown that the Xtreme Memory can be inserted to further boost the Gaia Memories if the users are compatible enough with the memories and each other. The Double Driver was originally created by the Museum to link to Raito, the person who has all the knowledge of the Earth in the form of the Gaia Library. However it was stolen by Kamen Rider Skull and Shotaro Hidari from the Narumi Detective Agency after Philip was rescued from the museum. Subsequently it was used by both Shotaro Hidari and Philip to transform into Kamen Rider Double in order to fight against the Museum Corporation.

Due to having Gaia Memories used retain their physical form when transformed instead of being absorbed, the user is completely shielded from their corrupting effects, at the cost of further weakening the memories' powers when not boosted during a Maximum Drive activation. As such, the Double Driver's Gaia Memories are specifically selected for various forms of combat and powers thought to be helpful in a combat situation, to compensate for their weakness against Dopants at their fullest strength.

Form Variants


The Double Driver is composed of the following parts:

  • Memory Slots (メモリスロット Memori Surotto) - The slots. Gaia Memories are inserted here to initiate transformation. Both Memory Slots have a Soul Forward (ソウルフォワード Souru Fowādo) function that sends Philip's consciousness into Shotaro's body (or Shotaro's consciousness into Philip's body for FangJoker.)
    • Right Slot (ライトスロット Raito Surotto) - The right slot. Philip owns this slot. Usually, the Cyclone, Heat or Luna Memories are inserted in here.
    • Left Slot (レフトスロット Refuto Surotto) - The left slot. Shotaro owns this slot. Usually, Joker, Metal or Trigger Memories are inserted here.
  • Maximum Slot (マキシマムスロット Makishimamu Surotto) - A slot located to the Double Driver's right side. It is a device that forcibly amplifies an inserted Gaia Memory's abilities. Once inserted, data within a Gaia Memory is calculated at high speed, resulting it energy that has been amplified twice.
  • Linkage Arms (リンケージアーム Rinkēji Āmu) - Two silver arm pieces that connects the Memory Slots to the Double Driver. Allows the Memory Slots to move (basically the 'hinges' of the Driver).
  • Drive Exhaust (ドライブエクゾースト Doraibu Ekuzōsuto) - Vents located under the Linkage Arms. They forcibly discharge the high heat produced by the Double Driver during Gaia Memory calculation (i.e. transforming or deathblows) to prevent the Driver from experiencing thermal runaway (i.e. melting).
  • Soul Port Cylinders (ソウルポートシリンダー Souru Pōto Shirindā) - Red cylinders located on the Memory Slots. They are devices that sends, receives and transfer signals when a Gaia Memory is inserted.
  • Power Stabiliser (パワースタビライザー Pawā Sutabiraizā) - A red device located in the middle of the Driver. It adjusts the left and right Gaia Memories to cancel out each other's abilities, preventing their energies from running rampant. Sends stable data towards the Thinking Engine.
  • Thinking Engine (シンキングエンジン Shinkingu Enjin) - The black segment located between the Power Stabiliser and the clear Gaia Processor. It is a circuit that performs high-speed computation of data recieevd from the Gaia Memories instantaneously. It controls the synchronisation of the two Memories.
  • Gaia Processor (ガイアプロセッサ Gaia Purosessa) - The clear panel located at the middle-bottom. During transformation, it glows whatever color of the Memories inserted are. Installed in it's back is the Double Driver's main CPU, which takes data of the Earth's Memories (地球の記憶 Chikyū no Kioku) from inserted Gaia Memories and convert them into energy, which is then sent into the user to allow transformation. It is also present in Philip's Double Driver, but it won't work unless a Gaia Memory is inserted.
  • GGD (Gaia Drive Disk) (GDD(ガイアドライブディスク) GDD (Gaia Doraibu Disuku)) - The Double Driver's black parts located towards the user; most of it is obscured by the Memory Slots over it. It is a hard disk that stores the Earth's Memories extracted from the Gaia Processor. 120TB of information can be stored, and can read/write information within 1/500 of a second.
  • Connection Belt Ring (コネクションベルトリング Konekushon Beruto Ringu) - The strap. It is one giant cable that connects the Double Driver, Maximum Slot and Spinal Connector together.
  • Spinal Connector (スパイナルコネクタ Supainaru Konekuta) - A unit located at the back of the Connection Belt Ring. Holds the Connection Belt Ring together around Kamen Rider Double's waist.



By inserting the Gaia Memories into the respective Memory Slots (メモリスロット Memori Surotto) on their belt buckles, Shotaro and Philip can transform into Kamen Rider Double. The Left Slot holds Shotaro's Gaia Memories and the Right Slot holds Philip's. If either Shotaro or Philip equips the Double Driver, a duplicate Double Driver will form over the abdomen of the other. When Philip puts a Gaia Memory into the Right Slot, he undergoes Soul Forward (ソウルフォワード Souru Fowādo), sending his soul to Shotaro to transform both of them into Kamen Rider Double. The process causes Philip's body to fall into a comatose state. If the Fang Memory is utilized by Phillip, the Soul Forward is reversed, with Shotaro's soul and the Joker Memory transferring to Philip's body, while Shotaro's own is rendered comatose.

As long as the Double Driver is worn by both Shotaro and Philip, they can telepathically communicate with each other provided that both of them are conscious outside the transformation to Kamen Rider Double. The transformation into Kamen Rider Double will be canceled if both Gaia Memories are removed and none are re-inserted for a certain amount of time.


Another slot on the right side of the Double Driver is called the Maximum Slot (マキシマムスロット Makishimamu Surotto). When a Memory is placed in the Maximum Slot, Kamen Rider Double can use a Maximum Drive (マキシマムドライブ Makishimamu Doraibu) finisher attack. This specific slot is used primarily for the Joker Memory to execute one of three different Maximum Drive finishers depending on Double's current form.

  • CycloneJoker: Joker Extreme (ジョーカーエクストリーム Jōkā Ekustorīmu): Double's body splits down the middle as the halves descend on their target. A variation of this attack involves Double jumping off the back wheel of Kamen Rider Accel Bike Form, allowing for faster acceleration upon descent.
  • HeatJoker: Joker Grenade (ジョーカーグレネード Jōkā Gurenēdo): Double somersaults in mid-air, then Double's body splits down the middle during descent as the halves each hit the target with elementally energized hooks.
  • LunaJoker: Joker Strange (ジョーカーストレンジ Jōkā Sutorenji): Double splits down the middle, with the Luna half making four copies of itself, and all five Luna halves execute rapid-fire karate chops on the target(s), then the Joker half strides in close to finish the target(s) off with a charged vertical chop

In other forms, it can be used to insert the right half's Memory, allowing for a Twin Maximum (ツインマキシマム Tsuin Makishimamu) attack, but this is immensely dangerous due to the strain it puts on Shotaro's body.

During the final battle with the Utopia Dopant, Kamen Rider Double CycloneJokerXtreme places the Prism Memory in the Maximum Slot to execute the Double Prism Xtreme (ダブルプリズムエクストリーム Daburu Purizumu Ekusutorīmu) Maximum Drive.


  • to be added

External links

Icon-w.png Kamen Rider W
Narumi Detective Agency
Shotaro Hidari - Philip - Akiko Narumi - Sokichi Narumi† - Tokime
Memory Drivers
Double Driver - Accel Driver - Lost Driver
Gaia Memory-related
Gaia Memories - Memory Gadgets - Fang Memory - Xtreme Memory - Trial Memory - Gaia Memory Enhancing Adapter
Metal Shaft - Trigger Magnum - Engine Blade - Skull Magnum - Prism Bicker - Eternal Edge - Shroud Magnum
RevolGarry - HardBoilder - Gunner A - Diablossa - SkullBoilder - SkullGarry - HardMammother
The Fuuto Irregulars
Santa-chan - Watcherman- Queen & Elizabeth - Isamu Bito
Futo Police Department
Ryu Terui - Mikio Jinno - Shun Makura
Museum and the Dopants
Foundation X
The Sonozaki Family: Terror - Claydoll - Taboo/R Nasca - Nasca - Smilodon - Masquerade Dopants
Dopants: Magma Dopant - T-Rex Dopant - Money Dopant - Anomalocaris Dopant - Cockroach Dopant - Sweets Dopant - Virus Dopant - Violence Dopant - Arms Dopant - Bird Dopant - Ice Age Dopant - Triceratops Dopant - Liar Dopant - Puppeteer Dopant - Invisible Dopant - Nightmare Dopant - Beast Dopant - Zone Dopant - Yesterday Dopant - Quetzalcoatlus Dopant - Gene Dopant - Jewel Dopant - Old Dopant - Utopia Dopant - Energy Dopant
Movie Exclusive Villains: Dummy Dopant - Heat Dopant - Trigger Dopant - Metal Dopant - Luna Dopant - Cyclone Dopant - Bat Dopant - Spider Dopant - Kamen Rider Eternal - Commander Dopant - Eyes Dopant
Novel-Exclusive Villains (The One Who Continues After Z): Zoo Dopant - Zero Dopant - Queen Bee Dopant - Flower Dopant - Elephant Dopant - Dolphin Dopant - Salamander Dopant - Fish Dopant - Bird Dopant - Ape Dopant - Bee Dopants
Manga Exclusive Villains (Futo Detective): Road Dopant - Aurora Dopant - Meganeura Dopant -Brachiosaurus Dopant - Scream Dopant - Alcohol Dopant - Puzzle Dopant - Reactor Dopant - Antlion Dopant - Owl Dopant - Trash Dopant - Caracal Dopant - Toadstool Dopant
Yukiji Bando - Kazuha - Hideo - Mamoru Nikaido - Sabu
Katsumi Daido - Maria S. Cranberry - Reika Hanehara - Kyosui Izumi - Gozo Domoto - Ken Ashihara
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