Torque sensor having detection element which detects elastic deformation by exertion of torque to be detected

A torque sensor which detects torque around a predetermined rotation axis,

• the torque sensor comprising:
• a first support body
• a second support body;
• a detection part which connects the first support body and the second support body, the detection part having a part which undergoes elastic deformation by exertion of torque to be detected;
• a detection element which detects elastic deformation occurring at the detection part;
• and
• a detection circuit which outputs an electric signal indicating exerted torque around the rotation axis exerted on one of the first support body in a state that a load is applied to the second support body, and cii) the second support body in a state that a load is applied to the first support body, the electric signal being outputted based on detection results of the detection element, wherein
• the detection part includes a first end and a second end opposite to the first end,
• the first end of the detection part is connected with the first support body, and the second end of the detection part is connected with the second support body,
• the detection part includes a first deformation part, a second deformation part and a displacement part,
• the first deformation part is connected with the second deformation part via the displacement part,
• the detection element comprises a capacitive element which includes a displacement electrode fixed to the displacement part and a fixing electrode opposing the displacement electrode, and
• the detection circuit outputs the electric signal indicating the exerted torque based on fluctuation in capacitance value of the capacitive element.