Rice hull was moulded into a tube (outer diameter : 54 mm; inner diameter : 17 mm, length : c. 170 mm) by use of an extruder and then carbonized in nitrogen atmosphere below 1000 degrees C. Ash content of the hull was 16 wt%, of which c. 94 and 4 wt% were SiO2 and K2O, respectively. Carbon yield and shrinkage of the mould after carbonization at 1000 degrees C were 42 wt%, and 43 vol%, respectively. The bulk density increased with rising of carbonization temperature to reach to 0.93 g ml(-1) at 1000 degrees C via 0.82 g ml(-1) at 500 degrees C. The largest compressive strength of 3.6 MPa was obtained after carbonization at 1000 degrees C. No micropore was developed after carbonization, and the total pore volume measured by a mercury porosimeter was 0.25-0.31 ml g(-1) after carbonization. These data were compared with those of charcoal.