PROBLEM TO BE SOLVED: To provide an optical fiber type sensor device capable of suitably detecting telescopic motion of a measuring object surface that expands and contracts along a surface direction.SOLUTION: An optical fiber type sensor device 1 includes a freely extendable sheet member 2 mounted onto a measuring object surface and optical fiber 3 having a stationary section 3x fixed onto the sheet member 2. The stationary section 3x of the optical fiber 3 includes a curved section 3a that is curved such that a curvature degree changes according to telescopic motion of the sheet member 2 along a surface direction. Light transmission characteristics of the optical fiber 3 changes in response to change in the curvature degree of the curved section 3a.SELECTED DRAWING: Figure 1【課題】面沿い方向に伸縮する測定対象面の伸縮を適切に検知することができる光ファイバ式センサ装置を提供する。【解決手段】光ファイバ式センサ装置１は、測定対象面に装着される伸縮自在なシート部材２と、シート部材２に固定された固定部分３ｘを有する光ファイバ３とを備える。光ファイバ３の固定部分３ｘは、シート部材２の面沿い方向の伸縮に応じて湾曲度合が変化するように湾曲された湾曲部３ａを含む。光ファイバ３は、湾曲部３ａの湾曲度合の変化に応じて光伝送特性が変化する。【選択図】図１
