Patent ID: 8600266

Claim:
A drive transmission device, comprising: at least one drive source configured to provide a driving force; a drive transmission member having an engaging part that engages a first rotary body provided within a unit detachably attachable to an image forming apparatus and a gear part operably engageable with a motor gear attached to the at least one drive source; a drive gear train that transmits the driving force from the at least one drive source to a second rotary body provided within the unit, the drive gear train having a first gear and a second gear, the first gear engaging the motor gear, the second gear attached to the drive transmission member; and a stationary holding member that holds the drive transmission member and does not transmit the driving force transmitted to the drive transmission member or the drive gear train, wherein both the second gear and the drive transmission member are held by the holding member and individually transmit the driving force, and the holding member has a cylinder and holds a part of the drive transmission member on an inner circumferential surface of the cylinder and the second gear on an outer circumferential surface of the cylinder.