A wind direction adjuster is disclosed in which an inner-side turning axis provided to a louver main body in a protruding manner is axially supported by an inner-side axial support hole provided in a spacer fixed to a bearing portion provided to a housing portion. Moreover, an actuator axis provided to the louver main body in a protruding manner at a position spaced from the inner-side turning axis is inserted into an operation opening provided to the spacer. In addition, a louver moves forward or rearward by pushing the actuator axis by a projecting portion in association with turning of a knob turnable with respect to the bearing portion and the spacer. The louvers can be moved in conjunction with each other with a simple configuration.