Heat exchanger

A heat exchanger that exchanges heat between a refrigerant and air, comprising:

• flat tubes disposed in a first direction intersecting with a longitudinal direction of cross sections of the flat tubes and through which the refrigerant flows;
• first heat transfer fins that contact the flat tubes and are disposed on a windward side of the flat tubes, wherein the first heat transfer fins are inserted toward the flat tubes from a side of first ends in the longitudinal direction;
• and
• second heat transfer fins that contact the flat tubes and are disposed on a leeward side of the flat tubes, wherein the second heat transfer fins are inserted toward the flat tubes from a side of second ends in the longitudinal direction, wherein
• the first heat transfer fins each comprise:
• first insertion portions that are each inserted between adjacent ones of the flat tubes;
• and
• a first connection portion that extends in the first direction and that connects the first insertion portions outside the first ends in the longitudinal direction of the cross sections of the flat tubes,
• the second heat transfer fins each comprise:
• second insertion portions that are each inserted between adjacent ones of the flat tubes;
• and
• a second connection portion that extends in the first direction and that connects the second insertion portions outside the second ends in the longitudinal direction of the cross sections of the flat tubes, and
• a distance in an air flow direction between the first heat transfer fins and the second heat transfer fins is equal to or greater than both:
• a fin pitch of the first heat transfer fins, and
• a fin pitch of the second heat transfer fins.