The present invention provides a cross flow fan that suppresses a reduction in flow path width between plural blades and in which there is little power loss caused by the fan. A cross flow fan 10 is equipped with a circular support plate 50 and plural blades 100. A radius rp of a pressure surface arc Rp of each of the blades 100 is greater than a radius rs of a suction surface arc Rs, and a radius ri of an inner peripheral side arc Ri is greater than a radius ro of an outer peripheral side arc Ro. Furthermore, a region of maximum thickness of the blade is located in a position 40% to 60% from the inner peripheral side arc Ri in a lengthwise direction. The blades 100 are disposed in such a way that the inner peripheral side arcs Ri are positioned on an inner peripheral side of the support plate and the outer peripheral side arcs Ro are positioned on an outer peripheral side of the support plate, and the blades have a structure wherein a flow path width between the plural blades gradually decreases from the inner peripheral side toward the outer peripheral side of the support plate.
