PURPOSE: An epoxy resin composition, containing an aluminum complex having a slaicylic ester derivative as a ligand and an organosilicon compound having silanol hydroxyl groups, etc. as a catalyst, having improved storage stability, and capable of giving a cured article having improved electrical characteristics even at a low temperature.

CONSTITUTION: An epoxy resin composition prepared by incorporating (A) an aluminum complex having at least one salicylic ester derivative as a ligand, e.g. the compounds of formulasI, II, etc., and (B) 0.01W5pts.wt., based on 100pts.wt. epoxy resin, organosilicon compound having silanol hydroxyl or hydrolyzable groups, preferably diphenylsilanediol, as a catalyst in an amount of 1W5 equivalents silanol hydroxyl or hydrolyzable groups in the compoent (B) based on one mole aluminum complex of the component (A).

EFFECT: A high catalytic ability even at a relatively low temperature and good compatibility with other materials, convenient for preparing solventless varnishes.