Rankine cycle system

A Rankine cycle system, comprising:

• a heat exchanger which is mounted on an engine and is configured to recover exhaust heat of the engine to refrigerant;
• an expander which is mounted on the engine and is configured to convert the exhaust heat recovered to the refrigerant into power by expanding the refrigerant whose temperature has been increased by the heat exchanger;
• a condenser which is mounted on a vehicle body and is configured to condense the refrigerant expanded by the expander;
• a refrigeration cycle of an air conditioner which is configured to share the condenser and the refrigerant;
• a first pipe which is connected to the expander;
• and
• a third pipe which is connected to the first pipe and a second pipe connected to a compressor of the refrigeration cycle and is configured to introduce the refrigerant to the condenser;
• wherein
• either one of the first and third pipes has higher flexibility than the other.