Heat exchanger and refrigeration cycle apparatus

A heat exchanger comprising:

• a fin extending in a gravity direction;
• and
• heat transfer pipes installed so as to intersect the fin, the heat transfer pipes being arranged in the gravity direction, wherein
• the fin has
• a water guiding area disposed above and below each of the heat transfer pipes, and
• a water drainage area disposed adjacent to a side of each of the heat transfer pipes,
• the water guiding area has water guiding structures for guiding water to the water drainage area, and
• the water drainage area has water drainage structures for guiding water in the gravity direction, wherein
• the water guiding structures are provided by forming a part of the fin in dimples,
• the water drainage structures are provided by forming a part of the fin in dimples, and
• the dimples of the water guiding structures and the dimples of the water drainage structures are arranged at different densities.