Novel polymers having a hole transport ability were prepared by condensation polymerization of N,N＇-diphenyl-N,N＇-bis(4-methylphenyl)-(1,1＇-biphenyl)-4,4＇-diamine (TPD) and paraformaldehyde (FA) or benzaldehyde (BzA). From NMR spectra, it is revealed that addition condensation reactions occurred exclusively at the para positions of TPD. TPD-FA polymer was linked not only by a methylene Linkage but also by a methylene ether linkage, while TPD-BzA polymer was only linked by a methine Linkage. The glass transition temperatures of TPD-FA and TPD-BzA were 185 and 239 degrees C, respectively. The drift mobility of TPD-BzA measured by a standard time-of-flight (TOF) method was found to be on the order of 10(-5) and 10(-6) cm(2)/(V s). The multilayer EL devices were fabricated using TPD-FA and TPD-BzA polymers as a hole transport layer and Alq as an electron transport emitting layer. In both devices, the initial driving voltage is about 4 V, and the maximum luminance is above 10 000 cd/m(2) at 14 V. It is expected that these polymers can be used as a hole transport material in the EL device.