A molded structure of a brushless fan motor, comprising: a stator including a plurality of stator poles configured by winding a slot winding around a salient pole portion of a core configured by laminating a plurality of steel sheets, the core including a plurality of the salient pole portions, using a slot of an insulator placed around the core; a circuit board fixed to the stator, in which an electronic component configuring a control circuit for controlling current flowing through the windings configuring the plurality of stator poles is mounted; a rotor including a plurality of rotor poles comprising a permanent magnet on an inner peripheral side, and a plurality of blades on an outer peripheral side; a stator-side case including: a bearing support tube portion housing a bearing (15, 16) for rotatably supporting a rotary shaft of the rotor; a housing portion surrounding an outer periphery of the blades of the rotor; a board storage portion configured to form a storage chamber of the circuit board together with the bearing support tube portion by covering an inner and an outer peripheral side of the circuit board excluding a portion on the rotor side and a side opposite to the rotor; and a plurality of webs coupling the board storage portion and the housing portion; and a molded portion in which at least the stator and the circuit board including the electronic component are molded with an insulation material, wherein at least a part of the circuit board is supported by a notch portion in a distal end portion of a projecting end formed on the board storage portion side and the rotary shaft side of the insulator, the board storage portion and the insulator are placed in such a manner as to surround a periphery of the bearing support tube portion, and wherein a first gap is provided between the distal end portion of the insulator that supports the circuit board and the bearing support tube portion and a second gap is provided between the distal end portion of the insulator that supports the circuit board and the board storage portion, a part of the molded portion is disposed in each of the first and second gaps (39a, 39b), and the entire circuit board located inside the storage chamber, excluding the portion supported by the projecting end formed on the board storage portion side of the insulator, is covered with the part of the molded portion. a stator including a plurality of stator poles configured by winding a slot winding around a salient pole portion of a core configured by laminating a plurality of steel sheets, the core including a plurality of the salient pole portions, using a slot of an insulator placed around the core; a circuit board fixed to the stator, in which an electronic component configuring a control circuit for controlling current flowing through the windings configuring the plurality of stator poles is mounted; a rotor including a plurality of rotor poles comprising a permanent magnet on an inner peripheral side, and a plurality of blades on an outer peripheral side; a stator-side case including: a bearing support tube portion housing a bearing (15, 16) for rotatably supporting a rotary shaft of the rotor; a housing portion surrounding an outer periphery of the blades of the rotor; a board storage portion configured to form a storage chamber of the circuit board together with the bearing support tube portion by covering an inner and an outer peripheral side of the circuit board excluding a portion on the rotor side and a side opposite to the rotor; and a plurality of webs coupling the board storage portion and the housing portion; and a bearing support tube portion housing a bearing (15, 16) for rotatably supporting a rotary shaft of the rotor; a housing portion surrounding an outer periphery of the blades of the rotor; a board storage portion configured to form a storage chamber of the circuit board together with the bearing support tube portion by covering an inner and an outer peripheral side of the circuit board excluding a portion on the rotor side and a side opposite to the rotor; and a plurality of webs coupling the board storage portion and the housing portion; and a molded portion in which at least the stator and the circuit board including the electronic component are molded with an insulation material, wherein at least a part of the circuit board is supported by a notch portion in a distal end portion of a projecting end formed on the board storage portion side and the rotary shaft side of the insulator, the board storage portion and the insulator are placed in such a manner as to surround a periphery of the bearing support tube portion, and wherein a first gap is provided between the distal end portion of the insulator that supports the circuit board and the bearing support tube portion and a second gap is provided between the distal end portion of the insulator that supports the circuit board and the board storage portion, a part of the molded portion is disposed in each of the first and second gaps (39a, 39b), and the entire circuit board located inside the storage chamber, excluding the portion supported by the projecting end formed on the board storage portion side of the insulator, is covered with the part of the molded portion.