Franky officially joins the Straw Hat Pirates at the end of the Water 7 / Post‑Enies Lobby Arc in One Piece.

Exact episode and chapter

  • Anime: Episode 322 , titled “Goodbye, My Lovable Followers! Franky Departs.”
  • Manga: Chapter 437 , titled “Naked but Great,” in Volume 45.

Where it happens in the story

  • After the crew escapes Enies Lobby, they regroup in Water 7 to finish building the Thousand Sunny.
  • Franky is initially reluctant, but Iceburg, the Straw Hats, and even a little “persuasion” (including his stolen Speedo) convince him to leave the Franky Family and Galley‑La Company and become the crew’s shipwright.

Quick reference table

Detail| Value
---|---
Anime episode| Episode 322 – “Goodbye, My Lovable Followers! Franky Departs” 13
Manga chapter| Chapter 437 – “Naked but Great” 15
Arc| Post‑Enies Lobby / Water 7 17
Role on crew| Shipwright, 8th member of the Straw Hat Pirates 57

Information gathered from public forums or data available on the internet and portrayed here.