An endoscope insertion shape observation probe including: a bobbin including a first insulation member provided at a front end of a core made of a magnetic member and a second insulation member provided at a rear end of the core a coil portion formed by winding metal lines on the core at least two terminal portions to which the metal lines are electrically connected and signal lines having wires electrically connected to the terminal portions and extended rearward while being sandwiched between an inner circumferential surface of a tube and an outer circumferential portion of the coil portion, wherein the two terminal portions has the wires brazed respectively on surface sides thereof, the surface sides being directed in opposite directions away from each other toward outward of each magnetic coil unit, which improves resistance property of signal lines connected to plural magnetic coil units without increasing an outer diameter.
