A centrifugal fan comprising: - a main plate; - a blade connected to the main plate; and - a shroud having an annular shape and connected to a shroud-side end of the blade that is an end opposite a main-plate-side end of the blade connected to the main plate, the centrifugal fan being configured to rotate about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction, the blade having - a leading edge that is an edge of the blade located forward in a rotation direction, and - a trailing edge that is an edge opposite the leading edge and is located farther from the rotation axis than is the leading edge, a length of the blade from the leading edge to the trailing edge in a section parallel to the main plate being a circumferential length, a distance between a peripheral edge of the main plate and a peripheral edge of the shroud being an outlet height, part of the blade that has a longest circumferential length being located closer to the shroud than is a middle of the outlet height, the leading edge including - a recess located next to a point P4 at which a shroud inner surface of the shroud that faces the main plate is connected to the leading edge, the recess including connection part extending from the point P4 toward the trailing edge and defining a valley-like shape having a bottom when the recess is viewed from the rotation axis, and - a projection which is located closer to the main plate than the recess is, the projection projecting in the rotation direction and having an inverted-V shape with a peak when the projection is viewed from the rotation axis, the outlet height being 2h, a point that is one of opposite ends of the projection and is located close to the main plate being a point P1_1, a point that is an other one of the opposite ends and is located close to the shroud being a point P3_1, a distance f1_1 between the point P1_1 and the main plate being set to satisfy 0.05 × 2h ≤ f1_1 ≤ 0.2 × 2h, a distance f3_1 between the point P3_1 and the main plate being set to satisfy 0.8 × 2h ≤ f3_1 ≤ 1.3 × 2h. - a main plate; - a blade connected to the main plate; and - a shroud having an annular shape and connected to a shroud-side end of the blade that is an end opposite a main-plate-side end of the blade connected to the main plate, the centrifugal fan being configured to rotate about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction, the blade having the centrifugal fan being configured to rotate about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction, the blade having - a leading edge that is an edge of the blade located forward in a rotation direction, and - a trailing edge that is an edge opposite the leading edge and is located farther from the rotation axis than is the leading edge, a length of the blade from the leading edge to the trailing edge in a section parallel to the main plate being a circumferential length, a distance between a peripheral edge of the main plate and a peripheral edge of the shroud being an outlet height, part of the blade that has a longest circumferential length being located closer to the shroud than is a middle of the outlet height, the leading edge including a length of the blade from the leading edge to the trailing edge in a section parallel to the main plate being a circumferential length, a distance between a peripheral edge of the main plate and a peripheral edge of the shroud being an outlet height, part of the blade that has a longest circumferential length being located closer to the shroud than is a middle of the outlet height, the leading edge including - a recess located next to a point P4 at which a shroud inner surface of the shroud that faces the main plate is connected to the leading edge, the recess including connection part extending from the point P4 toward the trailing edge and defining a valley-like shape having a bottom when the recess is viewed from the rotation axis, and - a projection which is located closer to the main plate than the recess is, the projection projecting in the rotation direction and having an inverted-V shape with a peak when the projection is viewed from the rotation axis, the outlet height being 2h, a point that is one of opposite ends of the projection and is located close to the main plate being a point P1_1, a point that is an other one of the opposite ends and is located close to the shroud being a point P3_1, a distance f1_1 between the point P1_1 and the main plate being set to satisfy 0.05 × 2h ≤ f1_1 ≤ 0.2 × 2h, a distance f3_1 between the point P3_1 and the main plate being set to satisfy 0.8 × 2h ≤ f3_1 ≤ 1.3 × 2h. the outlet height being 2h, a point that is one of opposite ends of the projection and is located close to the main plate being a point P1_1, a point that is an other one of the opposite ends and is located close to the shroud being a point P3_1, a distance f1_1 between the point P1_1 and the main plate being set to satisfy 0.05 × 2h ≤ f1_1 ≤ 0.2 × 2h, a distance f3_1 between the point P3_1 and the main plate being set to satisfy 0.8 × 2h ≤ f3_1 ≤ 1.3 × 2h.