PURPOSE: To provide a mixed flow fan suitable for a high pressure loss field.

CONSTITUTION: A first region 18 defined in a position near a rear edge side beyond the center of a joining front end between a blade 14 on a suction side 5 and a boss 13, a front edge, and an outermost edge 17 is formed into a shape of an axial flow blade. A second region 20 defined by a joining portion of the boss from the joining rear end of the boss 13 on a discharge side 3 to the joining front edge of the boss 13, and a blade rear edge from the joining rear edge of the boss to the front edge through the outer diameter rear edge of a blade is formed into a shape of a centrifugal flow blade. Furthermore, a third region 21 connecting the first region 18 on the suction side 5 to the second region 20 on the discharge side in a continuous curve is formed into a shape of a mixed flow blade. Consequently, it is possible to stably and smoothly blow air in the mixed flow direction between the axial direction and the radial direction.