Outdoor unit of air conditioner

An outdoor unit of an air conditioner, comprising:

• a case forming an outer appearance of the outdoor unit;
• a barrier that divides an inner space of the case into a heat exchange space and an electric space;
• a heat exchanger disposed in the heat exchange space;
• a fan disposed in the heat exchange space;
• a control box assembly disposed in the electric space, the control box assembly, including at least one printed circuit board;
• a refrigerant cycle device including a compressor disposed in the electric space;
• and
• a shield assembly disposed in the electric space between the barrier and the control box assembly and configured to completely surround an outside of the refrigerant cycle device, wherein at least one pipe penetration hole through which a refrigerant pipe connected to the refrigerant cycle device passes is formed on one side of the shield assembly.