molded member s 5 it is noted that although no particular limitation is imposed on the resin used as long as it is the one that converts into solid phase carbon one resin selected from the group including phenol resole novolak furan polyimide polyamide imide polyether imide polycarbodiimide and bisallyldiimide or combination thereof may be used within the range within which its property is not impaired solvent may be used in combination when necessary after the impregnated with the matrix the molded member are baked at temperature 800 to 1 000 u00b0 c and thereby the matrix is carbonized in n 2 atmosphere s 7 after the carbonization s 7 it is judged whether it disposes of the graphitizing s 8 if it is judged that it does not dispose of the graphitizing s 8 no when go back to step 4 and repeating this process 2 to 4 times for densification on the other hand if it is judged that it disposes of the graphitizing s 8 yes when go to step 9 and the graphitizing at temperature of 2 000 to 2 500 u00b0 c s 9 on the other hand when infiltrating method by cvi is selected the hydrocarbon.