Refrigerant evaporator

A refrigerant evaporator in which heat is exchanged between a fluid to be cooled and a refrigerant, the refrigerant evaporator comprising:

• a first heat exchange part in which the refrigerant flows to exchange heat between the fluid to be cooled and the refrigerant;
• a second heat exchange part in which the refrigerant flows to exchange heat between the fluid to be cooled and the refrigerant, the second heat exchange part being arranged to oppose the first heat exchange part;
• a first tank arranged below the first heat exchange part to distribute the refrigerant to the first heat exchange part;
• a second tank arranged below the second heat exchange part to collect the refrigerant flowing through the second heat exchange part;
• and
• a third tank joined to the first tank and the second tank by brazing and to introduce the refrigerant collected by the second tank to the first tank, wherein
• one of joint portions between the first tank and the third tank or one of joint portions between the second tank and the third tank has a projection part,
• the other of the joint portions between the first tank and the third tank or the other of the joint portions between the second tank and the third tank has an insertion part in which the projection part is inserted,
• an external surface of the projection part and an internal surface of the insertion part are brazed to each other at a brazing place,
• the brazing place is one of a plurality of brazing places,
• at least one drain groove is formed between the first tank and the third tank or between the second tank and the third tank, and
• the drain groove separates the plurality of brazing places.