Air conditioner

An air conditioner, comprising:

• a main body including:
• a first side,
• a second side opposite to the first side,
• an outlet between the first side and the second side, and
• a guide protrusion on the outlet;
• and
• a blade configured to open and close the outlet, the blade including:
• a blade body extending from the first side to the second side of the main body when the outlet is closed by the blade, and
• a guide rail on a top surface of the blade body facing the outlet,
• wherein the blade is configured so that:
• the blade body is rotatable relative to the outlet to adjust a direction of flow of air discharged from the outlet, and
• the guide rail is supported by the guide protrusion so as to be slidable to guide at least one of a translational movement or a rotational movement of the blade body with respect to the main body during rotation of the blade body.