An electrophotographic image forming apparatus comprising: an electrophotographic photoreceptor comprising: an electroconductive substrate; a charge generation layer; and a charge transport layer in this order, a charger; an irradiator; an image developer; and a transferer applying an electric current not less than 65 .mu.A to the electrophotographic photoreceptor, wherein the charge generation layer comprises titanylphthalocyanine crystals having a CuK.alpha. 1.542 .ANG. X-ray diffraction spectrum having plural diffraction peaks, wherein a maximum diffraction peak is observed at a Bragg (2.theta.) angle of 27.2.degree.; main peaks are observed at 9.4.degree., 9.6.degree. and 24.0.degree.; and a minimum diffraction peak is observed at 7.3.degree.; and no diffraction peak is observed at an angle greater than 7.3.degree. and less than 9.4.degree., wherein said angles may vary by .+-.0.2.degree. and the minimum interval where no peak is observed between required peaks at 7.3 and 9.4 is 2.0 degrees absolute or more.