CROSS FLOW FAN

To provide a cross flow fan that can suppress a reduction in resistance to loss of speed, and that can achieve a reduction in fan input and a reduction in noise. Therefore, a negative pressure surface (132) of each of blades (130) of a cross flow fan (100) has a convex part (161) that bulges toward a counter-rotation direction. In a cross section C perpendicular to a rotation axis (140), the convex part of the blade is located on an inner circumferential side of an outer edge (133) of the blade concerned and on an outer circumferential side of an outermost circle of virtual circles (20) tangent to both the negative pressure surface of the blade concerned and the positive pressure surface of the blade adjacent to the counter-rotational side of the blade concerned. In the cross section C, the convex part and a portion of the negative pressure surface on the inner circumferential side of the convex part are connected by a straight part (162). In the cross section C, the straight part is a tangent to both the convex part and the portion of the negative pressure surface on the inner circumferential side of the convex part.