A centrifugal fan comprising: a main plate for rotating about an axis of rotation; a shroud having an inlet port for introduction of air; and a plurality of blades circumferentially arranged between the main plate and the shroud so as to form a flow of air by accelerating air introduced through the inlet port , wherein: the shroud has an inside surface including a curved surface which is convex toward the main plate , for guiding the flow of air; the curved surface of the shroud has a diffusion section (DS) extending radially so as to be gradually away from the main plate to an outer periphery of the shroud ; the main plate has a curved surface extending radially so as to be gradually away from the shroud to an outer periphery of the main plate ; and the curved surface of the shroud in the diffusion section (DS) at least partially overlaps with the curved surface of the main plate when viewed in a direction of the axis of rotation, characterized in that each blade has a pressure surface formed such that a portion thereof (RC) is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point (V) and a portion thereof (CRC) is concave toward the axis of rotation at a lower side of the inflection point (V). a main plate for rotating about an axis of rotation; a shroud having an inlet port for introduction of air; and a plurality of blades circumferentially arranged between the main plate and the shroud so as to form a flow of air by accelerating air introduced through the inlet port , wherein: the shroud has an inside surface including a curved surface which is convex toward the main plate , for guiding the flow of air; the curved surface of the shroud has a diffusion section (DS) extending radially so as to be gradually away from the main plate to an outer periphery of the shroud ; the main plate has a curved surface extending radially so as to be gradually away from the shroud to an outer periphery of the main plate ; and the curved surface of the shroud in the diffusion section (DS) at least partially overlaps with the curved surface of the main plate when viewed in a direction of the axis of rotation, characterized in that each blade has a pressure surface formed such that a portion thereof (RC) is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point (V) and a portion thereof (CRC) is concave toward the axis of rotation at a lower side of the inflection point (V). the shroud has an inside surface including a curved surface which is convex toward the main plate , for guiding the flow of air; the curved surface of the shroud has a diffusion section (DS) extending radially so as to be gradually away from the main plate to an outer periphery of the shroud ; the main plate has a curved surface extending radially so as to be gradually away from the shroud to an outer periphery of the main plate ; and the curved surface of the shroud in the diffusion section (DS) at least partially overlaps with the curved surface of the main plate when viewed in a direction of the axis of rotation, characterized in that each blade has a pressure surface formed such that a portion thereof (RC) is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point (V) and a portion thereof (CRC) is concave toward the axis of rotation at a lower side of the inflection point (V). <EOS>