The Rainbow Pen (レインボーペン Reinbō Pen) is a pen-like device that allows the girls in Rainbow Pretty Cure☆Destinies Unfold to transform into Pretty Cure.
The Rainbow Pen allows the girls to transform into their Cure forms when they shout out the phrase "Pretty Cure, Rainbow Power!".
When the Cures hold up the Rainbow Pen to the sky and summon the power of their respective rainbow (ie. Cure Arancia summons the power of the Orange Rainbow), this will allow the Cures to perform their finishing attack.
A theme-coloured pen with a translucent golden cap. On the top of the cap, there is a gold circle with the Cures' respective symbol on it.
- The Rainbow Pen is the first transformation item to be a pen.