(57) There is provided an wind direction adjusting apparatus in which an energy saving effect is obtained by restraining an increase in draft resistance, and an indoor unit of an air conditioner having the wind direction adjusting apparatus provided therein. An wind direction adjusting apparatus 200 includes a base member 40, a first wind direction plate 12 provided on the base member 40 so as to be rotatable about a reference center of rotation A, a second wind direction plate 22 provided on the first wind direction plate 12 so as to be rotatable about a coupled center of rotation B, a moving member 30 provided with the first wind direction plate 12 and the second wind direction plate 22 so as to be rotatable about a first center of rotation C and a second center of rotation D respectively, and driving means 50 configured to move the moving member 30 relatively with respect to the base member 40, and an angle formed between a first imaginary line L1 connecting the reference center of rotation A and the coupled center of rotation B and a second imaginary line L2 connecting the coupled center of rotation B and the second center of rotation D varies according to the amount of relative movement of the moving member 30.