A self-cooled motor capable of being attached to a wall surface of a high temperature chamber through two or more attachment portions, and including a shaft arranged to extend into the high temperature chamber, the self-cooled motor comprising: the shaft, the shaft being supported by a bearing so as to be rotatable about a rotation axis; a rotor holder having a bottom and being cylindrical, including a cylindrical portion and a bottom plate portion, and arranged to rotate together with the shaft; a rotor magnet fixed to an inside of the cylindrical portion of the rotor holder; a stator arranged radially inside the rotor magnet; a housing arranged to support the bearing and the stator; and at least one blade arranged to rotate together with the shaft, at least a portion of each blade being arranged axially below the bottom plate portion of the rotor holder; wherein an outer circumferential end of each blade is arranged radially outward of an outer circumferential surface of the cylindrical portion of the rotor holder; the housing includes: a base portion arranged axially above the rotor holder; and the two or more attachment portions, each attachment portion being arranged radially outward of the rotor holder; characterized in that the housing includes an outlet edge portion arranged in a lower end of the housing and between adjacent ones of the attachment portions, and arranged to define a main air outlet axially below, the main air outlet being arranged to connect a space radially inside the housing and a space radially outside the housing with each other; the bottom plate portion of the rotor holder includes a rotor vent hole arranged to pass therethrough in an axial direction, the outer circumferential end of each blade is arranged radially outward of the rotor vent hole, and the at least one blade is arranged to generate an air current traveling radially outward so that air which has passed axially inside and through the motor is discharged through the main air outlet. the shaft, the shaft being supported by a bearing so as to be rotatable about a rotation axis; a rotor holder having a bottom and being cylindrical, including a cylindrical portion and a bottom plate portion, and arranged to rotate together with the shaft; a rotor magnet fixed to an inside of the cylindrical portion of the rotor holder; a stator arranged radially inside the rotor magnet; a housing arranged to support the bearing and the stator; and at least one blade arranged to rotate together with the shaft, at least a portion of each blade being arranged axially below the bottom plate portion of the rotor holder; wherein an outer circumferential end of each blade is arranged radially outward of an outer circumferential surface of the cylindrical portion of the rotor holder; the housing includes: a base portion arranged axially above the rotor holder; and the two or more attachment portions, each attachment portion being arranged radially outward of the rotor holder; a base portion arranged axially above the rotor holder; and the two or more attachment portions, each attachment portion being arranged radially outward of the rotor holder; characterized in that the housing includes an outlet edge portion arranged in a lower end of the housing and between adjacent ones of the attachment portions, and arranged to define a main air outlet axially below, the main air outlet being arranged to connect a space radially inside the housing and a space radially outside the housing with each other; the bottom plate portion of the rotor holder includes a rotor vent hole arranged to pass therethrough in an axial direction, the outer circumferential end of each blade is arranged radially outward of the rotor vent hole, and the at least one blade is arranged to generate an air current traveling radially outward so that air which has passed axially inside and through the motor is discharged through the main air outlet.