Detecting device

A detecting device comprising:

• a band-shaped flexible substrate;
• a first strain gage provided in the substrate, and including a plurality of first strain gage elements provided in a form of a row at predetermined intervals in a length direction of the substrate;
• a second strain gage provided in the substrate, and including a plurality of second strain gage elements provided in a form of a row at predetermined intervals in the length direction of the substrate;
• a third strain gage provided in the substrate, and including a plurality of third strain gage elements provided in a form of a row at predetermined intervals in the length direction of the substrate;
• a fourth strain gage provided in the substrate, and including a plurality of fourth strain gage elements provided in a form of a row at predetermined intervals in the length direction of the substrate;
• and
• a detecting circuit connected to each of the first to fourth strain gage elements,
• each of the first to fourth strain gages being disposed via an insulating layer in the substrate such that an extending direction of the first to fourth strain gages is along the length direction of the substrate,
• the first to fourth strain gages being laminated in this order in a thickness direction of the substrate such that the extending direction of the first to fourth strain gages is a same direction,
• the second strain gage elements and the third strain gage elements being arranged symmetrically from a position of a center in the thickness direction of the substrate, and being superposed on each other as viewed in plan,
• the first strain gage elements and the fourth strain gage elements being arranged symmetrically from the position of the center in the thickness direction of the substrate, and being superposed on each other as viewed in plan,
• the first strain gage elements and the second strain gage elements being shifted from each other in the length direction of the substrate as viewed in plan,
• the third strain gage elements and the fourth strain gage elements being shifted from each other in the length direction of the substrate as viewed in plan.