An air conditioner indoor unit , comprising: a housing , the housing including a first accommodating portion having a first accommodating space and a second accommodating portion having a second accommodating space, the first accommodating portion having an air outlet , and the second accommodating space being located at a front side of the first accommodating space; an inner air deflector , the inner air deflector being pivotally disposed in the first accommodating space; an outer air deflector , the outer air deflector being pivotally disposed in the second accommodating space; and two outer driving devices , the two outer driving devices being respectively disposed at a left side and a right side of the housing to drive the outer air deflector to rotate between a second closed position and a second open position; wherein the housing includes: an outer cover , wherein the first accommodating portion is disposed on the outer cover ; and a left side cover and a right side cover respectively disposed at a left side and a right side of the outer cover , the second accommodating portion being jointly constituted by the outer cover , the left side cover and the right side cover ; characterized in that , when the inner air deflector is in a closed state, a thickness of an upper end of the inner air deflector is larger than a thickness of a lower end of the inner air deflector; the first accommodating portion includes a first arc panel protruding backward, and a first left side plate and a first right side plate that are respectively located at a left side and a right side of the first arc panel ; the first arc panel , the first left side plate and the first right side plate define the first accommodating space, and the inner air deflector is pivotally mounted in the first accommodating space. a housing , the housing including a first accommodating portion having a first accommodating space and a second accommodating portion having a second accommodating space, the first accommodating portion having an air outlet , and the second accommodating space being located at a front side of the first accommodating space; an inner air deflector , the inner air deflector being pivotally disposed in the first accommodating space; an outer air deflector , the outer air deflector being pivotally disposed in the second accommodating space; and two outer driving devices , the two outer driving devices being respectively disposed at a left side and a right side of the housing to drive the outer air deflector to rotate between a second closed position and a second open position; wherein the housing includes: an outer cover , wherein the first accommodating portion is disposed on the outer cover ; and a left side cover and a right side cover respectively disposed at a left side and a right side of the outer cover , the second accommodating portion being jointly constituted by the outer cover , the left side cover and the right side cover ; an outer cover , wherein the first accommodating portion is disposed on the outer cover ; and a left side cover and a right side cover respectively disposed at a left side and a right side of the outer cover , the second accommodating portion being jointly constituted by the outer cover , the left side cover and the right side cover ; characterized in that , when the inner air deflector is in a closed state, a thickness of an upper end of the inner air deflector is larger than a thickness of a lower end of the inner air deflector; the first accommodating portion includes a first arc panel protruding backward, and a first left side plate and a first right side plate that are respectively located at a left side and a right side of the first arc panel ; the first arc panel , the first left side plate and the first right side plate define the first accommodating space, and the inner air deflector is pivotally mounted in the first accommodating space. <EOS>