An object of the present invention is to provide a sensor device which is used in the state of being bonded to a living body, thereby making it possible to trace a deformation of a surface of the living body easily and further attain the tracing surely. The sensor device includes a sensor element. The sensor element includes a sheet-like first dielectric layer including an elastomer composition and a first electrode layer and a second electrode layer each including an electro-conductive composition containing carbon nanotubes. The first and the second electrode layers are formed on a top surface and a bottom surface of the first dielectric layer respectively, and are at least partially opposed to each other across the first dielectric layer. The at least partially opposed portions of the first and the second electrode layers constitute a detection portion, and the sensor element is reversibly deformable to change in an area of the top surface and the bottom surface of the first dielectric layer. The sensor device includes the measurement instrument for measuring a change in a capacitance of the detection portion. The sensor device is used in the state of being bonded to a living body and is utilized to trace a deformation of a surface of the living body.本發明的感測裝置包括:感測元件,包括包含彈性體組成物的片狀的第1介電層、以及第1電極層及第2電極層,第1電極層及第2電極層包含含有碳奈米管的導電性組成物,且以隔著第1介電層而至少一部分相向的方式分別形成於第1介電層的表面及背面,將第1電極層及第2電極層的相向的部分作為檢測部,且以第1介電層的表背面的面積發生變化的方式可逆地變形;以及測量器,對檢測部的靜電電容的變化進行測量;將感測裝置貼附於生物體而使用,以用於生物體表面的變形的追蹤。1‧‧‧感測裝置2‧‧‧感測元件3‧‧‧測量器3a‧‧‧斯密特觸發器振盪電路3b‧‧‧F/V轉換電路4‧‧‧顯示器4a‧‧‧監視器4b‧‧‧運算電路4c‧‧‧記憶部
