Sensor unit and sensor unit-equipped battery wiring module

A sensor unit comprising:

• a band-shaped and flexible conductive path structure including a laminated conductor and an insulating film that covers the conductor;
• a sensor element that is arranged on a surface of the conductive path structure and is connected to the conductor;
• a lower housing including a sensor element accommodation part that surrounds the sensor element and is fixed to the surface of the conductive path structure;
• a coil spring configured to bias the lower housing toward a detection target;
• and
• an upper housing that is attached to the lower housing with the coil spring interposed therebetween in an axial direction of the coil spring,
• wherein the lower housing includes a support portion supporting an end portion of the coil spring in the axial direction,
• the upper housing includes a positioning protrusion that protrudes in the shape of a tapered tube toward the lower housing, and is inserted into another end portion of the coil spring in the axial direction,
• the lower housing is displaceable toward the positioning protrusion in response to an elastic deformation of the coil spring that shrinks in the axial direction, and is biased toward the detection target in response to elastic recovery of the coil spring,
• the other end portion of the coil spring has an engagement projection formed by a bare wire of the coil spring protruding to an inner circumferential side of the coil spring so as to be deflectable and deformable,
• the positioning protrusion has, in a base end portion thereof, a receiving recess that is open in an outer circumferential surface of the positioning protrusion and is recessed to an inner circumferential side, and in which the engagement projection is received and locked, and
• due to deflection and deformation of the engagement projection, the positioning protrusion is allowed to be inserted into the coil spring, and due to elastic recovery of the engagement projection, the engagement projection is received and locked in the receiving recess, and the coil spring is held by the upper housing.