Patent ID: 8011891

Claim:
A centrifugal multiblade fan that sucks air from one end side of an axial direction of a rotation axis to a radial inside of the centrifugal multiblade fan, and blows the air to a radial outside of the centrifugal multiblade fan, the centrifugal multiblade fan comprising a plurality of blades located around the rotation axis, wherein each blade has a leading edge positioned at the radial inside, and a trailing edge positioned at the radial outside, wherein each blade has a ventral surface on a forward side in a rotation direction, and a back surface opposite to the ventral surface, wherein the leading edge has a first angle part on a side of the ventral surface, and a second angle part on a side of the back surface, wherein at least the second angle part has an edge shape with a radius of curvature R of 0.2 mm or less, and wherein a blade thickness of each blade increases gradually from both the leading edge and the trailing edge to a thickness portion in a chordwise direction.