an electrophotographic photoconductor having a conductive support and a photosensitive layer disposed on the conductive support and containing a charge generation substance and a charge transportation substance;

charging means for charging the electrophotographic photoconductor;

exposure means for forming electrostatic latent images by applying exposure corresponding to image information to the charged electrophotographic photoconductor;

developing means containing toners, for developing the electrostatic latent images by supplying toners to the surface of the electrophotographic photoconductor thereby forming toner images; and

transfer means for transferring the toner images from the surface of the electrophotographic photoconductor to a recording medium, wherein,

the charge transportation substance contained in the photosensitive layer of the electrophotographic photoconductor contains

an enamine compound represented by the following general formula (2), and

a volume average particle diameter of the toners contained in the developing means is in a range from 4 μm to 7 μm

wherein b, c and d each represent an optionally-substituted alkyl group, an optionally-substituted alkoxy group, an optionally-substituted dialkylamino group, an optionally-substituted aryl group, a halogen atom, or a hydrogen atom; i, k and j each indicate an integer of from 1 to 5; when i is 2 or more, then the “b”s may be the same or different and may bond to each other to form a cyclic structure; when k is 2 or more, then the “c”s may be the same or different and may bond to each other to form a cyclic structure; and when j is 2 or more, then the “d”s may be the same or different and may bond to each other to form a cyclic structure;

Ar⁴ and Ar⁵ each represent a hydrogen atom, an optionally-substituted aryl group, an optionally-substituted heterocyclic group, an optionally-substituted aralkyl group, or an optionally-substituted alkyl group, but it is excluded that Ar⁴ and Ar⁵ are hydrogen atoms at the same time; Ar⁴ and Ar⁵ may bond to each other via an atom or an atomic group to form a cyclic structure; “a” represents an optionally-substituted alkyl group, an optionally-substituted alkoxy group, an optionally-substituted dialkylamino group, an optionally-substituted aryl group, a halogen atom, or a hydrogen atom; m indicates an integer of from 1 to 6; when m is 2 or more, then the “a”s may be the same or different and may bond to each other to form a cyclic structure.