An electrostatic latent image developer containing a carrier, a toner, and an electric field adjusting agent. The electric field adjusting agent is formed as particles having an average particle size smaller than that of the carrier, and contains a magnetic powder in a specific amount less than that of a magnetic powder contained in the carrier and greater than that of a magnetic powder contained in the toner. The magnetic powder may be deposited on the surface of each particle of the electric field adjusting agent to form a conductive layer capable of smoothly taking or imparting charges away from or to the toner. Accordingly, an electric field formed in a gap between a developing sleeve and a photosensitive member can be intensified to thereby prevent an edge effect and enhance a permittivity in this gap. Accordingly, the electrostatic latent image formed on the photosensitive member can be faithfully developed.