A guidewire includes a core shaft, a coil body, and a tip portion. The coil body covers a distal end portion of the core shaft. The tip portion is formed by coupling a distal end of the coil body and a distal end of the core shaft using metal solder. The tip portion includes an outside diameter decreasing portion and a hemisphere-shaped portion. The outside diameter of the outside diameter decreasing portion decreases linearly in a direction of a distal end. The hemisphere-shaped portion is positioned at a distal end of the outside diameter decreasing portion.
