Heat exchanger and air handling unit

A heat exchanger that exchanges heat between air carried by an air flow and a refrigerant, the heat exchanger comprising:

• a plurality of flat tubes that are arranged along a first direction, allow the refrigerant to flow inside, and are made of an aluminum or aluminum alloy as a material;
• a heat transfer fin that is provided between the adjacent flat tubes and is made of an aluminum or aluminum alloy as a material;
• and a cover covering at least a part of the flat tube, wherein each of the plurality of flat tubes includes a first portion extending in a predetermined direction when viewed from the first direction, a second portion extending in a predetermined direction different from a direction in which the first portion extends when viewed from the first direction, and a connecting portion that connects the first portion and the second portion such that an angle between the direction in which the first portion extends and a direction in which the second portion extends is less than 180° when viewed from the first direction, the heat transfer fin is connected to the first portion and the second portion, andthe cover covers at least a part of a plurality of the connecting portions.