Electronic device, washer and method for manufacturing washer

An electronic device comprising:

• a circuit board including a through hole passing through the circuit board;
• a member including a screw hole corresponding to the through hole;
• a screw including a screw body having an outer diameter smaller than an inner diameter of the through hole and a screw head having an outer diameter larger than the inner diameter of the through hole, wherein the screw body penetrates through the through hole to engage with the screw hole and the screw head is disposed on an opposite side of the circuit board to the member;
• and
• a first washer provided between the screw head and the circuit board, the first washer including a first washer body and a plurality of first washer legs extending from the first washer body toward the circuit board, the first washer legs being in contact with the circuit board and having a characteristic of reducing stress on the circuit board from the first washer legs upon being heated.