An electrophotographic photoreceptor comprising: a conductive substrate; and a photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, wherein the charge generation layer contains hydroxygallium phthalocyanine, wherein the charge transport layer has an average thickness of 30 μm or greater, the charge transport layer contains a polyarylate resin, and an absorption spectrum measured by peeling off the photosensitive layer and dissolving the photosensitive layer in tetrahydrofuran satisfies Expression and Expression, Iu ≤ 0.95 × Im 1.05 × Im ≤ Il in a case where a total length of the electrophotographic photoreceptor in an axial direction is defined as L, Im represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled from a center of the total length of the electrophotographic photoreceptor in the axial direction, Iu represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward one end, and Il represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward the other end, wherein the absorbance of the photosensitive layer at a wavelength of 678 nm is measured according to a measurement method as described in paragraphs of the description. a conductive substrate; and a photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, wherein the charge generation layer contains hydroxygallium phthalocyanine, wherein the charge transport layer has an average thickness of 30 μm or greater, the charge transport layer contains a polyarylate resin, and an absorption spectrum measured by peeling off the photosensitive layer and dissolving the photosensitive layer in tetrahydrofuran satisfies Expression and Expression, Iu ≤ 0.95 × Im 1.05 × Im ≤ Il in a case where a total length of the electrophotographic photoreceptor in an axial direction is defined as L, Im represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled from a center of the total length of the electrophotographic photoreceptor in the axial direction, Iu represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward one end, and Il represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward the other end, wherein the absorbance of the photosensitive layer at a wavelength of 678 nm is measured according to a measurement method as described in paragraphs of the description. in a case where a total length of the electrophotographic photoreceptor in an axial direction is defined as L, Im represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled from a center of the total length of the electrophotographic photoreceptor in the axial direction, Iu represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward one end, and Il represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the total length of the electrophotographic photoreceptor in the axial direction toward the other end, wherein the absorbance of the photosensitive layer at a wavelength of 678 nm is measured according to a measurement method as described in paragraphs of the description.