Heat exchanger for vehicle

A heat exchanger for a vehicle comprising:

• a plurality of plates layered to alternately form a first flow channel and a second flow channel therein to exchange heat of operation fluids passing through each of the first and second flow channels, the plurality of plates having a first outermost surface connected to an expansion valve;
• first and second inflow holes formed separately at each of the plurality of plates and connected to the first flow channel and the second flow channel, respectively;
• first and second exhaust holes formed separately at each of the plurality of plates and connected to the first flow channel and the second flow channel, respectively;
• and
• a noise reducer integrally connected to a second outermost surface of the plurality of plates opposing the first outermost surface, the noise reducer reducing noise and vibration occurring when an operation fluid that is injected through the second inflow hole moves,
• wherein the noise reducer comprises:
• at least one noise reduction plate having one surface layered at the second outermost surface, the at least one noise reduction plate having a protruding end which protrudes toward the second outermost surface and having a connection hole which communicates with the second exhaust hole;
• a resonance hole in which one side of the protruding end is opened to communicate with the connection hole;
• and
• a closing and sealing plate mounted to an outer side of the at least one noise reduction plate to be in contact with the protruding end and forming a space which communicates with the resonance hole between the closing and sealing plate and the at least one noise reduction plate.