PROBLEM TO BE SOLVED: To provide a base material that has high affinity with biological tissue, has excellent followability to body motion and excellent durability, hardly absorbs water, and can be reduced in size, and provide a printed wiring board, biological contact device, biological implant device and artificial organ.SOLUTION: The present invention provides a base material 12 used for a biological contact device, biological implant device or artificial organ, the base material 12 having a fluororesin layer 20 containing fluororesin, and the fluororesin layer 20 having a breaking elongation at 200°C of 20-400%.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2020,JPO&INPIT【課題】生体組織との親和性が高く、体の動きに対する追従性及び耐久性に優れ、吸水しにくく、かつ小型化が可能な基材、プリント配線板、生体接触デバイス、生体埋込デバイス及び人工臓器の提供。【解決手段】生体接触デバイス、生体埋込デバイス又は人工臓器に用いられる基材１２であり、基材１２がフッ素樹脂を含むフッ素樹脂層２０を有し、フッ素樹脂層２０の２００℃における切断時伸びが２０～４００％である。【選択図】図２
