A guidewire (1, 11, 21, 101, 111) includes a core shaft (2) and a coil body (3, 13, 23, 33, 43) that covers the core shaft (2). The guidewire also includes a tip portion, an intermediate fixing portion, and a proximal-end fixing portion that fix the core shaft (2) and the coil body (3, 13, 23, 33, 43) to each other. The coil body (3, 13, 23, 33, 43) includes a single core wire formed of a tungsten wire and a single side wire formed of a stainless steel wire. The side wire is wound around the core wire so as to cover the outer periphery of the core wire.
