Exhaust heat recovery device

An exhaust heat recovery device comprising:

• a main flow path configured such that exhaust gas flows therethrough;
• a heat exchanger arranged to surround a circumference of the main flow path, the heat exchanger having a plurality of heat exchange flow paths configured to allow introduction of at least a portion of the exhaust gas flowing through the main flow path, the plurality of heat exchange flow paths being configured to carry out heat exchange between the portion of the exhaust gas and a heat exchange medium;
• a supply flow path arranged to surround the circumference of the main flow path, the supply flow path being configured to allow introduction of the at least a portion of the exhaust gas flowing through the main flow path, and the supply flow path being configured such that the portion of the exhaust gas flows therethrough, and the flowing exhaust gas is supplied to the plurality of heat exchange flow paths while being branched;
• a discharge flow path configured to merge and discharge the heat-exchanged exhaust gas having passed through the plurality of heat exchange flow paths;
• a wall portion arranged to surround the circumference of the main flow path, the wall portion facing the plurality of heat exchange flow paths across the supply flow path;
• and
• a valve configured to open and close the main flow path,
• wherein the supply flow path is configured to be narrower toward a downstream side in a flow direction of the exhaust gas through the supply flow path, and
• wherein the wall portion is formed in a tubular shape so as to widen the main flow path toward a downstream side in a flow direction of the exhaust gas through the main flow path.