Provided is a driving force transmission device including a sun gear that rotates by receiving a driving force from a driving source, an internal gear that is arranged coaxially with the sun gear, a planetary gear that engages with the sun gear and the internal gear, a rotary member that is provided coaxially with the sun gear and the internal gear and installed with the planetary gear so as to rotate corresponding to revolution of the planetary gear, and an urging member that urges the planetary gear toward the rotary member.