The magnetic property of 3,17-bis(4,4-dimethyl-3-oxazolidine-1-oxyl)-5 alpha-androstane (OXZAN), in which two nitroxyl radicals were bonded to 5 alpha-androstane, was investigated by measurements of ESR spectra and magnetic susceptibility. ESR spectrum of the OXZAN is composed of 5-line which means that intramolecular exchange interaction take place with through-bond mechanism. No dilution effect on the line shape of the 5-line spectrum and observation of half-field transition support the mechanism. The measurement of magnetic susceptibility shows that magnetic interaction is intermolecularly antiferromagnetic. 4-(2,2,6,6-Tetramethylpiperidin-1-oxyl-4-oxy)phenyl-4’(6-acryloyloxy-hexyloxy)benzoate (TPOB) was prepared as vinyl monomer with mesogen in which the formation of liquid crystalline was confirmed by observing birefringence under a polarizing microscope (x 600). The measurement of magnetic susceptibility shows that the magnetic interaction of this monomer is ferromagnetic.