an object of the present invention is to provide a charge transport material and an electrophotographic photoreceptor using the charge transport material , the charge transport material sufficiently satisfying characteristics conventionally desired for a charge transport material for an electrophotographic photoreceptor , specifically , the charge transport material having a good solubility in a binder polymer , allowing formation of a stable and high - concentration organic thin film therefrom , and having a high carrier mobility . to achieve the object , the present invention provides a trisamine derivative represented by the following general formula : wherein r1 represents a methyl group or methoxy group , and r2 represents a hydrogen atom , methyl group , or methoxy group , provided that a case where r1 and r2 are a methyl group and r2 is at the meta - position is excluded ; wherein 50 % or more of geometrical isomers have three double bonds which are all trans .