|This article is about a/an transformation device in Kamen Rider W.|
The Accel Driver (アクセルドライバー Akuseru Doraibā) is Kamen Rider Accel's transformation belt. It is a third generation Memory Driver given to Ryu Terui by the mysterious woman known only as "Shroud". The Accel Driver resembles a set of motorcycle handlebars. By inserting the Accel Memory into the Mono Slot (モノスロット Mono Surotto) and revving the Power Throttle (パワースロットル Pawā Surottoru) on the right handlebar, Ryu transforms into Kamen Rider Accel. By squeezing the Maximum Clutch Lever (マキシマムクラッチレバー Makishimamu Kuratchi Rebā) on the left handlebar and revving the Power Throttle, Kamen Rider Accel can initiate his Accel Glanzer (アクセルグランツァー Akuseru Gurantsā) Maximum Drive finisher.
Unlike all other Memory Drivers that came before, the Accel Driver is built specifically to be used with the Accel Memory, and later the Trial Memory. While it allows the user to be completely shielded from the Gaia Memory's corrupting effects, it does so at the cost of weakening the power of the Gaia Memory even further, just like how it is with the Double Driver. However, this is somewhat mitigated by the fact that the Accel Driver is specifically designed to only work only with these two Memories, harnessing their fullest potential, and use of the Engine Blade and Engine Memory, all of which allows functionalities of the Accel and Trial Memories to be used to the fullest, in order to compensate for the power loss suffered.