The arc discharge method was the first method developed for producing multiwalled carbon nanotubes (MWNTs). Generally, this method is carried out in low-pressure He gas or other neutral atmospheres, which requires the use of sealed reaction chambers and vacuum equipment. At high temperatures, the method produces well-graphitized MWNTs. Here, we report the first successful trial of the facile synthesis of high-quality MWNTs in a high yield using the arc discharge method in foam. [DOI: 10.1380/ejssnt.2008.167]