A centrifugal fan comprising: a main plate that is driven to rotate around a rotational axis; a shroud that is disposed so as to be opposed to the main plate, including an intake port to take in air; and a plurality of blades that are disposed upright between the main plate and the shroud, wherein in two adjacent blades among the plurality of blades, an adjacent distance between trailing edges is gradually decreased in a direction from the shroud to the main plate, at least from a certain point in the direction from the shroud to the main plate, and wherein in each blade of the plurality of blades, an inclination of a negative pressure surface of the each blade which extends from the main plate toward the shroud is smaller at least in a vicinity of a trailing edge than an inclination of a pressure surface of the each blade which extends from the main plate toward the shroud, wherein with regard to an angle between a blade surface (19a, 19b) and the main plate, an angle on the negative pressure surface side is larger than an angle on the pressure surface side at a joint part of the main plate and the blade, and wherein the inclination of the negative pressure surface of the each blade corresponds to the angle on the negative pressure surface side, and the inclination of the pressure surface of the each blade corresponds to the angle on the pressure surface side; characterized in that the negative pressure surface of the each blade has a warping shape, in the direction opposite to the rotational direction of the centrifugal fan, that increases from a leading edge to a trailing edge of the blade and as a cross-section (401, 402) of the blade nears the main plate. a main plate that is driven to rotate around a rotational axis; a shroud that is disposed so as to be opposed to the main plate, including an intake port to take in air; and a plurality of blades that are disposed upright between the main plate and the shroud, wherein in two adjacent blades among the plurality of blades, an adjacent distance between trailing edges is gradually decreased in a direction from the shroud to the main plate, at least from a certain point in the direction from the shroud to the main plate, and wherein in each blade of the plurality of blades, an inclination of a negative pressure surface of the each blade which extends from the main plate toward the shroud is smaller at least in a vicinity of a trailing edge than an inclination of a pressure surface of the each blade which extends from the main plate toward the shroud, wherein with regard to an angle between a blade surface (19a, 19b) and the main plate, an angle on the negative pressure surface side is larger than an angle on the pressure surface side at a joint part of the main plate and the blade, and wherein the inclination of the negative pressure surface of the each blade corresponds to the angle on the negative pressure surface side, and the inclination of the pressure surface of the each blade corresponds to the angle on the pressure surface side; characterized in that the negative pressure surface of the each blade has a warping shape, in the direction opposite to the rotational direction of the centrifugal fan, that increases from a leading edge to a trailing edge of the blade and as a cross-section (401, 402) of the blade nears the main plate.