Heat exchanger

A heat exchanger comprising:

• a plurality of main plates each including a through-hole through which a heat exchange medium flows, and an outer wall formed at a periphery thereof, the plurality of main plates being stacked to constitute a heat exchanger core having a flow path formed therein;
• an endplate being in surface contact with the main plate disposed at an outermost side of the heat exchanger core, the endplate having one or more connection holes;
• and
• a connection member configured to be connected to an external component and at least partially inserted into the connection hole,
• wherein a first screw thread is formed in the connection member, and the first screw thread is formed in a direction parallel to the direction in which the connection member is inserted into the connection hole,
• wherein an inner side of the connection hole is closed off by the main plate,
• wherein the connection member has a head portion and a column portion, the first screw thread is formed in the head portion, and a diameter of the head portion is larger than a diameter of the column portion and a diameter of the connection hole, and
• wherein the column portion is inserted from an outer side of a protruding portion of the end plate, which is the open side of the connection hole, and is fixed by being fitted with the connection hole.