A bending sensor comprising: a base material; a sensor body arranged on a surface of the base material and containing a matrix resin and conductive filler particles filled in the matrix resin at a filling rate of 30% by volume or more, and in which three-dimensional conductive paths are formed by contact among the conductive filler particles and an electrical resistance increases as an deformation amount increases; an elastically deformable cover film arranged so as to cover the sensor body; a plurality of electrodes (12a-12i) connected to the sensor body and capable of outputting electrical resistances; and cracks formed in advance in the sensor body along such a direction that the conductive paths are cut off during a bending deformation, characterized by: a strain adjustment plate arranged on a rear surface of the base material; and an adhesion layer bonding the strain adjustment plate and the base material, wherein the base material, the strain adjustment plate, and the adhesion layer are all made from materials having a glass-rubber transition region, in which a storage elastic modulus transitions, on a lower temperature side than a lower temperature limit of an operating temperature range of the bending sensor minus 10 °C, or on a higher temperature side than an upper temperature limit of the operating temperature range of the bending sensor plus 10 °C. a base material; a sensor body arranged on a surface of the base material and containing a matrix resin and conductive filler particles filled in the matrix resin at a filling rate of 30% by volume or more, and in which three-dimensional conductive paths are formed by contact among the conductive filler particles and an electrical resistance increases as an deformation amount increases; an elastically deformable cover film arranged so as to cover the sensor body; a plurality of electrodes (12a-12i) connected to the sensor body and capable of outputting electrical resistances; and cracks formed in advance in the sensor body along such a direction that the conductive paths are cut off during a bending deformation, characterized by: a strain adjustment plate arranged on a rear surface of the base material; and an adhesion layer bonding the strain adjustment plate and the base material, wherein the base material, the strain adjustment plate, and the adhesion layer are all made from materials having a glass-rubber transition region, in which a storage elastic modulus transitions, on a lower temperature side than a lower temperature limit of an operating temperature range of the bending sensor minus 10 °C, or on a higher temperature side than an upper temperature limit of the operating temperature range of the bending sensor plus 10 °C. a strain adjustment plate arranged on a rear surface of the base material; and an adhesion layer bonding the strain adjustment plate and the base material, wherein the base material, the strain adjustment plate, and the adhesion layer are all made from materials having a glass-rubber transition region, in which a storage elastic modulus transitions, on a lower temperature side than a lower temperature limit of an operating temperature range of the bending sensor minus 10 °C, or on a higher temperature side than an upper temperature limit of the operating temperature range of the bending sensor plus 10 °C.