A liquid, epoxy resin composition suitable for use in fixation of a stator coil or a rotor coil is disclosed, which comprises (A) a mixture containing (a.sub.1) a Bisphenol A epoxy resin and (a.sub.2) an alicyclic epoxy resin; and (B) a curing agent including (b.sub.1) an acid anhydride, and (b.sub.2) a phenol compound of the general formula: ##STR1## wherein R.sup.1 and R.sup.2 represent independently from each other a lower alkyl, R.sup.3 represents a lower alkylene and n is an integer of 1-5, the amount of the phenol compound (b.sub.2) being in the range of 2-8% based on the weight of the mixture (A).