A fan motor of a vacuum cleaner, comprising: a motor mount that defines an inner space therein; a motor part accommodated in the inner space of the motor mount; and an impeller disposed in an upper side of the motor mount and configured to be rotated by the motor part; and an impeller cover that covers the impeller, that is disposed at the upper side of the motor mount, and that defines an air inlet at an upper central portion of the impeller cover, wherein the motor mount defines: an air discharge opening configured to discharge air discharged from the impeller to an outer space of the motor mount, wherein the air discharge opening is defined at a lower edge of the impeller cover, a cooling flow path outlet that is disposed at the upper side of the motor mount and that is disposed between the impeller and the air discharge opening, and a first cooling flow path inlet disposed at a position vertically below the air discharge opening and the cooling flow path outlet, and wherein the air discharge opening is further configured to discharge air discharged from the cooling flow path outlet to an outer space of the motor mount, characterized in that the fan motor further comprises a guide that is configured to direct, in an upward direction, at least a portion of air that is discharged through the air discharge opening and introduced to the inner space through the first cooling flow path inlet. a motor mount that defines an inner space therein; a motor part accommodated in the inner space of the motor mount; and an impeller disposed in an upper side of the motor mount and configured to be rotated by the motor part; and an impeller cover that covers the impeller, that is disposed at the upper side of the motor mount, and that defines an air inlet at an upper central portion of the impeller cover, wherein the motor mount defines: an air discharge opening configured to discharge air discharged from the impeller to an outer space of the motor mount, wherein the air discharge opening is defined at a lower edge of the impeller cover, a cooling flow path outlet that is disposed at the upper side of the motor mount and that is disposed between the impeller and the air discharge opening, and a first cooling flow path inlet disposed at a position vertically below the air discharge opening and the cooling flow path outlet, and wherein the air discharge opening is further configured to discharge air discharged from the cooling flow path outlet to an outer space of the motor mount, characterized in that the fan motor further comprises a guide that is configured to direct, in an upward direction, at least a portion of air that is discharged through the air discharge opening and introduced to the inner space through the first cooling flow path inlet. an air discharge opening configured to discharge air discharged from the impeller to an outer space of the motor mount, wherein the air discharge opening is defined at a lower edge of the impeller cover, a cooling flow path outlet that is disposed at the upper side of the motor mount and that is disposed between the impeller and the air discharge opening, and a first cooling flow path inlet disposed at a position vertically below the air discharge opening and the cooling flow path outlet, and wherein the air discharge opening is further configured to discharge air discharged from the cooling flow path outlet to an outer space of the motor mount, characterized in that the fan motor further comprises a guide that is configured to direct, in an upward direction, at least a portion of air that is discharged through the air discharge opening and introduced to the inner space through the first cooling flow path inlet. a cooling flow path outlet that is disposed at the upper side of the motor mount and that is disposed between the impeller and the air discharge opening, and a first cooling flow path inlet disposed at a position vertically below the air discharge opening and the cooling flow path outlet, and wherein the air discharge opening is further configured to discharge air discharged from the cooling flow path outlet to an outer space of the motor mount, characterized in that the fan motor further comprises a guide that is configured to direct, in an upward direction, at least a portion of air that is discharged through the air discharge opening and introduced to the inner space through the first cooling flow path inlet.