Image forming apparatus

A post-processing apparatus comprising:

• a first conveyor configured to convey a sheet conveyed along a first conveyance passage downstream from the first conveyor;
• a second conveyor configured to convey the sheet along a second conveyance passage;
• a third conveyor configured to convey the sheet along a third conveyance passage;
• and
• a conveyance passage corrector configured to
• retract from a joining position at which the third conveyance passage joins to the first conveyance passage, and
• turn a conveyance direction of the sheet toward the first conveyor when the sheet enters from the third conveyance passage to the first conveyance passage
• wherein the conveyance passage corrector includes:
• a plate configured to correct the conveyance direction of the sheet in the first conveyance passage;
• a biasing member configured to bias a surface direction of the plate toward the first conveyor;
• and
• an elastic member disposed at a downstream end of the plate in the conveyance direction, the elastic member being deformable in a direction orthogonal to the conveyance direction.