Synthesis of singlewalled and doublewalled carbon nanotubes by hot-filament chemical vapor deposition using alcohol as carbon source has been attempted. Cobalt particles obtained by scratching a polycrystal cobalt plate with a sheet of sandpaper were used as catalyst for carbon nanotube growth. Catalyst temperature was mainly 700^oC, and the vapor pressure of alcohol was mainly 80 Torr. Products were evaluated by transmission electron microscope, Raman spectroscopy and thermogravimetric analysis. Nevertheless the size of cobalt particles extended from 2 nm to 80 nm, single and doublewalled carbon nanotubes were synthesized with a high yield of above 80%. To synthesize such thin tubes, it is important to use methanol as carbon source and to make the synthesis duration short. However, neither single nor doublewalled carbon nanotubes were synthesized at all by using ethanol instead of methanol.