A refrigeration apparatus comprising: a heat-source-side unit including a heat-source-side heat exchanger; a plurality of utilization-side units each including a utilization-side heat exchanger and an expansion valve circuit portion, the utilization-side units being connected in parallel with the heat-source-side unit through a liquid interconnecting pipe and a gas interconnecting pipe to form a refrigerant circuit circulating a refrigerant therethrough; and a controller, wherein each of the expansion valve circuit portion includes: a temperature sensitive utilization-side expansion valve; a main pipe allowing the refrigerant to flow between the utilization-side heat exchanger and the liquid interconnecting pipe via the utilization-side expansion valve; a bypass pipe allowing the refrigerant to bypass the main pipe and flow between the utilization-side heat exchanger and the liquid interconnecting pipe; a switching mechanism switching each of the main pipe and the bypass pipe between an open state and a closed state; the controller is configured to control the switching mechanism such that, if a defrosting operation in which the refrigerant circulates through the refrigerant circuit to cause the utilization-side heat exchangers of the utilization-side units to function as condensers and cause the heat-source-side heat exchanger to function as an evaporator is started, the main pipe is closed, and the bypass pipe is opened in each of the plurality of utilization-side units; wherein the controller is configured to control the switching mechanism such that, if the defrosting operation is started and the utilization-side heat exchanger of any one of the utilization-side units is completely defrosted, the bypass pipe of the utilization-side unit having the defrosted utilization-side heat exchanger switches from an open state to a closed state. a heat-source-side unit including a heat-source-side heat exchanger; a plurality of utilization-side units each including a utilization-side heat exchanger and an expansion valve circuit portion, the utilization-side units being connected in parallel with the heat-source-side unit through a liquid interconnecting pipe and a gas interconnecting pipe to form a refrigerant circuit circulating a refrigerant therethrough; and a controller, wherein each of the expansion valve circuit portion includes: a temperature sensitive utilization-side expansion valve; a main pipe allowing the refrigerant to flow between the utilization-side heat exchanger and the liquid interconnecting pipe via the utilization-side expansion valve; a bypass pipe allowing the refrigerant to bypass the main pipe and flow between the utilization-side heat exchanger and the liquid interconnecting pipe; a switching mechanism switching each of the main pipe and the bypass pipe between an open state and a closed state; the controller is configured to control the switching mechanism such that, if a defrosting operation in which the refrigerant circulates through the refrigerant circuit to cause the utilization-side heat exchangers of the utilization-side units to function as condensers and cause the heat-source-side heat exchanger to function as an evaporator is started, the main pipe is closed, and the bypass pipe is opened in each of the plurality of utilization-side units; wherein the controller is configured to control the switching mechanism such that, if the defrosting operation is started and the utilization-side heat exchanger of any one of the utilization-side units is completely defrosted, the bypass pipe of the utilization-side unit having the defrosted utilization-side heat exchanger switches from an open state to a closed state.