Image forming apparatus

An image forming apparatus, comprising:

• an apparatus body configured to perform image forming processing on a sheet;
• an in-body discharge section formed in the apparatus body as in-body space having an opening opened outward of the apparatus body and capable of accommodating the sheet on which the image forming processing has been performed;
• a first exit port formed in the apparatus body and opened toward the in-body space;
• and
• a relay unit detachably mounted in the in-body discharge section and configured to receive a sheet discharged from the first exit port and to convey the sheet,
• wherein the relay unit includes:
• a relay conveyance path which the sheet passes;
• a conveyance roller provided in the relay conveyance path and configured to convey the sheet in the relay conveyance path;
• a drive device configured to rotate the conveyance roller;
• and
• a guide plate configured to switch a conveyance path for a sheet discharged from the first exit port between a first path via the relay unit and a second path other than the first path, and
• the drive device changes the posture of the guide plate between a first posture corresponding to the first path and a second posture corresponding to the second path.