|This article is about a/an vehicle in Kamen Rider W and Kamen Rider Decade.|
|"Heat, Maximum Drive!"|
|―Finisher announcement via Double Driver[src]|
The HardMammother (ハードマンモシャー Hādo Manmoshā) was originally the Mecha Mammoth (メカマンモス Meka Manmosu), a mammoth-like giant robot used by Super Shocker against the Kamen Riders. The Dummy Dopant briefly uses it, but after Kamen Riders Double and Decade remove him, Kamen Rider Double takes control of it by docking the front half of the HardBoilder into its head and changing to HeatMetal form, which turns the mecha red. Its weapons include its trunk, which has a chainsaw-like blade, and its tusks, which can be fired as projectiles and retrieved by chains; the Mammoth Mecha originally had a cluster of three beam cannons as its "eyes", but Decade destroyed these when he attacked the Dummy Dopant, thus the "eyes" section was replaced with HardBoilder's front section. Kamen Rider Double performs a Heat Memory Maximum Drive with the machine, which causes it to burst into flames and perform a suicide attack on the enemy while Kamen Rider Double gets away with the HardTurbuler; this attack is used to destroy the Super Crisis Fortress, but destroys the HardMammother as well. The HardMammother only appears in Kamen Rider × Kamen Rider W & Decade: Movie War 2010.
- It is the first mammoth based mech in the franchise.