A disk specimen prepared from char obtained by carbonizing 3 wt % iron-loaded larch at 850 degrees C was superior and comparable to those from acetylene black and Ketjenblack, respectively, in electroconductivity. Subsequent soaking of the wood char in a diluted acid for removal of the metal led to improvement in the quality to surpass the level of Ketjenblack. Also, the carbonization with 3 wt % iron at 850 degrees C was more effective than that with 2wt% nickel at 900 degrees C for enhancing the conductivity. The more favorable catalysis of iron can be elucidated by the formation of finer nanocarbon particles with higher mesoporosity to compensate for the less crystallinity.