Coupling mechanism

A coupling mechanism that couples a first apparatus and a second apparatus, wherein

• on a side of the first apparatus,
• a projection that protrudes to a side of the second apparatus,
• a first connector that is arranged at a first distance from the projection in a second direction intersecting a first direction which is in a protruding direction of the projection, and
• a guiding member that is arranged at a position closer to the first connector than to the projection in the second direction and that has two protrusions arranged side by side in a third direction intersecting both the first direction and the second direction are arranged,
• on the side of the second apparatus,
• a hole portion that receives the projection when the first apparatus and the second apparatus are coupled,
• a second connector that is arranged at the first distance from the hole portion in the second direction and connected to the first connector when the first apparatus and the second apparatus are coupled, and
• a guided member that extends in a direction intersecting the third direction and is guided between the two protrusions of the guiding member when the first apparatus and the second apparatus are coupled are arranged, and
• the second connector is configured to move in the third direction together with the guided member.