In the present study, we develop a stretchable electret energy harvester with intrinsically-stretchable fluorinated electret to capture the kinetic energy of stretching motion of human skin. We employ perfluoro-elastomer FFKM, which exhibits a record-high surface charge density as well as an almost linear stress-strain curve. The output power of stretchable electret energy harvester is estimated by FEM simulation. The early prototype has been successfully microfabricated through the MEMS processes.