An airflow-direction adjustment device includes a plurality of fins disposed approximately in parallel relative to a support portion inside a case, and located on right and left side faces wherein one end side in a plate width direction is pivotally supported turnably; a link mechanism associating two or more fins; and a switch linked to the link mechanism to adjustably switch between a parallel air-blowing mode wherein the fins become approximately parallel to each other, and a scattered air-blowing mode wherein two or more fins are turned in directions opposite to each other. The switch is movably assembled to an intermediate fin, and the link mechanism includes a first link turnably connecting one end side corresponding to other end sides in a plate width direction of first fins disposed on both adjacent sides of the intermediate fin respectively, and turnably connecting a corresponding other end side to the switch respectively.