PROBLEM TO BE SOLVED: To provide a fluororesin base material having high affinity with a biological tissue and capable of being used suitably for a biological information measurement device and an artificial organ, and to provide a printed wiring board.SOLUTION: A fluororesin base material of the present invention which is used for a biological information measurement device outputting information about a living body or an artificial organ configuring the living body includes a fluororesin as a main component and has a modified layer in at least a part region of an outside surface, the modified layer having a siloxane bond and a hydrophilic organic function. A contact angle between the outside surface of the modified layer and a pure water is preferably no more than 90°. A printed wiring board of the present invention includes the fluororesin base material and a conductive pattern laminated on the outside surface of the modified layer. The printed wiring board may preferably have one or more electronic components mounted on the conductive pattern. The printed wiring boards are laminated on at least part of the outside surface of the conductive pattern and the electronic component, and may preferably further include a film having fluororesin as a main component.COPYRIGHT: (C)2015,JPO&INPIT【課題】生体組織との親和性が高く、生体情報測定デバイス及び人工臓器に好適に使用できるフッ素樹脂基材及びプリント配線板を提供する。【解決手段】本発明のフッ素樹脂基材は、生体に関する情報を出力する生体情報測定デバイス又は生体を構成する人工臓器に用いられるフッ素樹脂基材であって、フッ素樹脂を主成分とし、外面の少なくとも一部の領域に改質層を有し、上記改質層が、シロキサン結合及び親水性有機官能基を含む。上記改質層の外面の純水との接触角としては、90°以下が好ましい。また本発明のプリント配線板は、当該フッ素樹脂基材と、上記改質層の外面に積層される導電パターンとを備える。上記プリント配線板が、上記導電パターンに実装される1又は複数の電子部品を有するとよい。上記プリント配線板が、上記導電パターン又は上記電子部品の少なくとも一部の外面に積層され、フッ素樹脂を主成分とするフィルムをさらに備えるとよい。【選択図】図3
