The present invention provides: a single-layer type electrophotographic photoreceptor for positive electrification which retains charging characteristics and can attain an extremely low residual potential and high sensitivity and which gives images reduced in density unevenness; and an image formation device which is equipped with the photoreceptor and attains a satisfactory image density. The present invention relates to an electrophotographic photoreceptor of the positive electrification type which comprises an electroconductive support and, disposed thereon, a photosensitive layer comprising at least a charge generation material, a hole transport material, an electron transport material, and a binder resin in the same layer, wherein when the initial surface potential V0 is set at +700 V and the electrophotographic photoreceptor is exposed to monochromatic light of 780 nm and examined in the dynamic mode, then the residual potential VL1, measured at a point where the exposure amount for latent-image formation is 0.3 [mu]J/cm2, is 130 V or less.