NOVELTY - An electroconductive primer composition comprises graphite particles, carbon black, amphoteric resin-type dispersing agent, binder, and aqueous liquid medium. The graphite particles contain leaf-like natural graphite having average particle diameter of 1-50 mu m. The average particle diameter of the carbon black is 0.01-0.3 mu m. The amphoteric resin-type dispersing agent is obtained by neutralizing one or more portions of carboxyl groups in a copolymer (A). The copolymer (A) is formed by copolymerizing the monomers.    USE - Electroconductive primer composition is used for formation of base layer of electrode used for non-aqueous secondary battery (all claimed) e.g. lithium-ion secondary battery used in motor vehicles and portable electronic devices e.g. digital camera and mobile telephone.    ADVANTAGE - The electroconductive primer composition enables the formation of electrode base layer with excellent adhesiveness, and provides the non-aqueous secondary battery with excellent charging or discharging cyclic characteristics and reduced interface contact resistance with respect to electrical power collector and compound-material layer.    DETAILED DESCRIPTION - An electroconductive primer composition comprises graphite particles, carbon black, amphoteric resin-type dispersing agent, binder, and aqueous liquid medium. The graphite particles contain leaf-like natural graphite having average particle diameter of 1-50 mu m. The average particle diameter of the carbon black is 0.01-0.3 mu m. The amphoteric resin-type dispersing agent is obtained by neutralizing one or more portions of carboxyl groups in a copolymer (A). The copolymer (A) is formed by copolymerizing the monomers comprising 5-70 wt.% ethylenically-unsaturated monomer (a) containing aromatic ring, 15-60 wt.% ethylenically-unsaturated monomer (b) containing carboxyl group, 1-80 wt.% ethylenically-unsaturated monomer (c) containing amino group, and 0-79 wt.% ethylenically-unsaturated monomer (d) different from monomer (a), monomer (b), and monomer (c) with respect to 100 wt.% of sum of total amount of monomer (a), monomer (b), monomer (C), and monomer (d). INDEPENDENT CLAIMS are included for the following:    (1) electrode base layer, which is obtained using the electroconductive primer composition;    (2) non-aqueous secondary battery electrode, which consists of the electrode base layer and a compound-material layer laminated on an electrical power collector; and    (3) non-aqueous secondary battery, which consists of a positive electrode or a negative electrode as the non-aqueous secondary battery electrode, and an electrolyte solution.