Provided is an indwelling member in a living body, the member being flexible and having sufficient strength. Also provided are a stent which is flexible and has sufficient strength, an embolization member which has a high embolization effect, a vasodilator kit, and an aneurysm embolization kit. An indwelling member in a living body of the invention is a double coil wound in coiling with a primary coil formed by winding a first wire of a metal in close coiling. The metallic wire has a diameter in the range of 14 µm to 200 µm, inclusive, and consists of a material selected from platinum, gold, palladium, tungsten, tantalum, cobalt, rhodium, titanium, alloys thereof, stainless steel, a nickel alloy, or a molybdenum alloy.
