A material for dielectric films is a polymerizable composition containing an organic solvent, and an adamantanepolycarboxylic acid derivative represented by following Formula (1): ##STR00001## wherein X is hydrogen atom, a hydrocarbon group or R.sup.4; R.sup.1, R.sup.2, R.sup.3 and R.sup.4 and are each independently a protected or unprotected carboxyl group, etc.; and Y.sup.1, Y.sup.2, Y.sup.3 and Y.sup.4 are each independently a single bond or a bivalent aromatic cyclic group; and an aromatic polyamine derivative represented by following Formula (2): ##STR00002## wherein Ring Z is a monocyclic or polycyclic aromatic ring; and R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are each a substituent bound to Ring Z and are each independently a protected or unprotected amino group, etc., dissolved in the organic solvent.