A medium correcting device includes: a first correction section that includes a first adjustment system to adjust mutually pressing forces between a first rod-like rotation body and a second rod-like rotation body, wherein a recording medium on which an image is formed passes between the first and second rod-like rotation bodies, and at least one of the first and second rod-like rotation bodies is driven to rotate at a driving speed according to the mutually pressing forces; and a second correction section that includes a second adjustment system to adjust mutually pressing forces between the circular surface of the first circularly-moving body and the outer circular surface of the belt member, wherein the recording medium passes between the first and second circularly-moving bodes, and at least one of the first and second circularly-moving bodes is driven to rotate at a driving speed according to the mutually pressing forces.