To provide a refrigerator configured to improve a dissipation effect in a machine compartment, while suppressing an increase in a manufacturing cost.

A refrigerator 1 includes a heat insulation box 2 forming a storage compartment, and a machine compartment 6 provided under the heat insulation box 2 and having a compressor 31 arranged for driving a refrigeration cycle, wherein the sidewall of the machine compartment 6 is formed by extending downward a side plate 7 forming the outer surface of the sidewall of the heat insulation box 2, and a protrusion 12 integrally formed with the side plate 7 while protruding from a peripheral edge 11a of a ventilation hole 11 by providing two or more ventilation holes 11 at the sidewall of the machine compartment 6.