A guidewire includes a core shaft, a coil body that covers the core shaft, and a joining portion formed of metal solder that couples the core shaft and the coil body. The coil body includes a tungsten wire and a noble metal plating layer that covers at least a portion of a surface of the tungsten wire. A surface of the noble metal plating layer has a first uneven shape, including at least one recess and at least one protrusion.