Stress sensor and stress detection sheet

A stress detection sheet comprising:

• a first electrode layer and a second electrode layer provided overlapping M×N detection areas for performing detection separately in M rows and N columns, M and N being integers equal to or greater than 2, the first electrode layer and the second electrode layer facing each other;
• and
• an insulating elastic body layer disposed between the first electrode layer and the second electrode layer, the insulating elastic body layer being configured to electrically insulate the first electrode layer and the second electrode layer from each other, and being made of an elastically deformable material, wherein
• the first electrode layer includes:
• M pairs of first row electrodes and second row electrodes, the first row electrodes and the second row electrodes extending over the N columns and being insulated from each other, and
• M first row wiring lines and M second row wiring lines connecting the M pairs of the first row electrodes and the second row electrodes to a circuit outside the stress detection sheet,
• the second electrode layer includes:
• N pairs of first column electrodes and second column electrodes, the first column electrodes and the second column electrodes extending over the M rows and being insulated from each other, and
• N first column wiring lines and N second column wiring lines connecting the N pairs of the first column electrodes and the second column electrodes to the circuit outside the stress detection sheet,
• between the first column electrode and the second column electrode in each pair, the second electrode layer includes M first grooves extending in a first direction, and M second grooves extending in a second direction intersecting the first direction in each row,
• the first row electrode in each pair is arranged overlapping the first grooves in the N columns,
• the second row electrode in each pair is arranged overlapping the second grooves in the N columns, and
• in each of the detection areas, each of the first row electrodes is configured to overlap the first grooves at a plurality of locations.