Electrically conductive powder includes polyhedral large particles and flakey small particles. The aspect ratio of the small particles is not less than 3 and is at least 1.3 times greater than that of the large particles. The electrically conductive powder is surface treated with a fatty acid. The electrically conductive powder has good contact among the polyhedral large particles and the flakey small particles. An electrically conductive paste of the electrically conductive powder achieves excellent electrical and thermal conductivities because the particles are in contact not at points but through surfaces. The electrically conductive paste is capable of filling via-holes in a satisfactory manner.