In an image forming apparatus, a paper discharge roller of a paper discharge unit has an upper roller as a driving roller and a lower roller as a driven roller. The lower roller has a nip roller which is fixed to a shaft and holds paper between the nip roller and the upper roller, and forming rollers having a diameter larger than that of the nip roller and arranged on both sides of the nip roller. Since a conveyance speed of the paper is constant, the number of revolutions of the forming roller having a large outer diameter is smaller than that of a nip roller having a small outer diameter. The friction between the forming roller and the paper is lower than that in conventional art. Attachment and accumulation of ink are suppressed, and inconvenience of contamination of the paper with ink upon paper discharge hardly occurs.