An impeller comprising: a main plate configured to be driven to rotate; an annular side plate provided opposite to the main plate and having a suction port for air; and a plurality of blades connected to the main plate and the side plate and arranged in a circumferential direction around a rotation axis of the main plate, wherein each of the plurality of blades has an inner peripheral end located adjacent to the rotation axis in a radial direction from the rotation axis, an outer peripheral end (15A, 15B) located closer to an outer circumferential side of the impeller than the inner peripheral end in the radial direction, a sirocco blade portion (12A1, 12B1) that includes the outer peripheral end (15A, 15B), has an outlet angle of greater than 90 degrees, and forms a forward-swept blade, and a turbo blade portion (12A2, 12B2) that includes the inner peripheral end and forms a swept-back blade, characterized in that each of the plurality of blades has an end portion that faces the suction port and a base portion that is connected to the main plate, and the end portion has a smaller thickness than a thickness of the base portion in the sirocco blade portion (12A1, 12B1), and wherein the end portion of each of the plurality of blades has a blade shape, and in the end portion having the blade shape, a first blade thickness of an inner circumferential side of the impeller is greater than a second blade thickness of the outer circumferential side, wherein each of the plurality of blades has a first region located closer to the main plate than a middle position of the blade in an axial direction along the rotation axis, and a second region located closer to the side plate than the first region, and wherein a blade length is a length of each of the plurality of blades in the radial direction, a blade length in the first region is longer than a blade length in the second region, and in the first region and the second region, a proportion of the turbo blade portion (12A2, 12B2) to the sirocco blade portion (12A1, 12B1) is higher than a proportion of the sirocco blade portion (12A1, 12B1) to the turbo blade portion (12A2, 12B2). a main plate configured to be driven to rotate; an annular side plate provided opposite to the main plate and having a suction port for air; and a plurality of blades connected to the main plate and the side plate and arranged in a circumferential direction around a rotation axis of the main plate, wherein each of the plurality of blades has an inner peripheral end located adjacent to the rotation axis in a radial direction from the rotation axis, an outer peripheral end (15A, 15B) located closer to an outer circumferential side of the impeller than the inner peripheral end in the radial direction, a sirocco blade portion (12A1, 12B1) that includes the outer peripheral end (15A, 15B), has an outlet angle of greater than 90 degrees, and forms a forward-swept blade, and a turbo blade portion (12A2, 12B2) that includes the inner peripheral end and forms a swept-back blade, an inner peripheral end located adjacent to the rotation axis in a radial direction from the rotation axis, an outer peripheral end (15A, 15B) located closer to an outer circumferential side of the impeller than the inner peripheral end in the radial direction, a sirocco blade portion (12A1, 12B1) that includes the outer peripheral end (15A, 15B), has an outlet angle of greater than 90 degrees, and forms a forward-swept blade, and a turbo blade portion (12A2, 12B2) that includes the inner peripheral end and forms a swept-back blade, characterized in that each of the plurality of blades has an end portion that faces the suction port and a base portion that is connected to the main plate, and the end portion has a smaller thickness than a thickness of the base portion in the sirocco blade portion (12A1, 12B1), and wherein the end portion of each of the plurality of blades has a blade shape, and in the end portion having the blade shape, a first blade thickness of an inner circumferential side of the impeller is greater than a second blade thickness of the outer circumferential side, wherein each of the plurality of blades has a first region located closer to the main plate than a middle position of the blade in an axial direction along the rotation axis, and a second region located closer to the side plate than the first region, and wherein a blade length is a length of each of the plurality of blades in the radial direction, a blade length in the first region is longer than a blade length in the second region, and in the first region and the second region, a proportion of the turbo blade portion (12A2, 12B2) to the sirocco blade portion (12A1, 12B1) is higher than a proportion of the sirocco blade portion (12A1, 12B1) to the turbo blade portion (12A2, 12B2).