Polymers having the diethynyldisilanylene and oligothienylene units were prepared by the reaction of 1,2-diethynyl-1,1,2,2-tetraethyldisilane with dibromooligothiophene in the presence of a Pd(PPh3)(4)-CuI catalyst in triethylamine or a mixture of a triethylamine and toluene solution. The molecular weights of the disilanylene polymers were calculated to be 6300-19000. The polymers with more than two thienylene units in their backbone exhibit their absorption in the visible region, and their absorption maxima are red-shifted about 10-50 nm relative to poly(disilanyleneoligothienylene)s bearing the same number of a thienylene group. The present polymers showed to be photoconducting in the visible light region and showed thermal cross-linking properties.