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 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 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 is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point and a portion thereof is concave toward the axis of rotation at a lower side of the inflection point. 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 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 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 is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point and a portion thereof is concave toward the axis of rotation at a lower side of the inflection point. 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 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 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 is convex in a direction away from the axis of rotation at an upper side of a predetermined inflection point and a portion thereof is concave toward the axis of rotation at a lower side of the inflection point.