For development of a human body model for electric shock, electroconductive paints with carbon black as a filler material were developed. The characteristics of the volume resistivities of thin films fabricated using the electroconductive paints were investigated as a function of the particle sizes and content of carbon black. With a carbon black particle size over $80;{mu}m$, agglomeration of carbon black powders was observed. The volume resistivity of the particles increased as the porosity increased and as the amount of carbon black decreased due to the agglomeration of carbon black powders. With a particle size of $4;{mu}m$ and $20;{mu}m$, agglomeration of carbon black powders was not observed and their porosities were measured as 0.86% and 1.12% with volume resistivities of $20;{Omega}{cdot}cm$ and $80;{Omega}{cdot}cm$ respectively. A carbon black particle size of less than $20;{mu}m$ is considered to be suitable as a type of electric-shock electroconductive paint for a human body model.