A receiver for a heat exchanger comprising: a first receiver body defining a first passageway and a second passageway in condition that one of the first passageway and the second passageway acts as an inlet hole (21, 37), and the remaining one of the first passageway and the second passageway acts as an outlet hole, the second passageway comprising a main body portion (221, 36); a second receiver body; a filter element (23, 34) filtering the second passageway; and a stop mesh being provided on the filter element (23, 34); the second passageway comprises a counter bore portion in communication with the main body portion (221, 36), and the main body portion (221, 36) is a segment close to an external of the inlet hole, and the counter bore portion is a segment close to an internal of the inlet hole; the filter element covering the counter bore portion so as to filter the second passageway; the counter bore portion comprises a first end opening directly covered by the filter element and a second end opening in communication with the main body portion (221, 36); and an area encircled by the first end opening of the counter bore portion is larger than a horizontal cross-sectional area of the main body portion (221, 36) adjacent to the counter bore portion, as a result that a relatively large filter interface can be achieved, characterized in that, the counter bore portion comprises a buffer space, an accommodating hole above and in communication with the buffer space and a positioning hole above and in communication with the accommodating hole, the filter element being received in the accommodating hole, the receiver further comprising a retaining plate at least partly received in the positioning hole, and the receiver further comprises a limiting portion located under the retaining plate and configured to prevent the retaining plate from inclining towards the filter element. a first receiver body defining a first passageway and a second passageway in condition that one of the first passageway and the second passageway acts as an inlet hole (21, 37), and the remaining one of the first passageway and the second passageway acts as an outlet hole, the second passageway comprising a main body portion (221, 36); a second receiver body; a filter element (23, 34) filtering the second passageway; and a stop mesh being provided on the filter element (23, 34); the second passageway comprises a counter bore portion in communication with the main body portion (221, 36), and the main body portion (221, 36) is a segment close to an external of the inlet hole, and the counter bore portion is a segment close to an internal of the inlet hole; the filter element covering the counter bore portion so as to filter the second passageway; the counter bore portion comprises a first end opening directly covered by the filter element and a second end opening in communication with the main body portion (221, 36); and an area encircled by the first end opening of the counter bore portion is larger than a horizontal cross-sectional area of the main body portion (221, 36) adjacent to the counter bore portion, as a result that a relatively large filter interface can be achieved, characterized in that, the counter bore portion comprises a buffer space, an accommodating hole above and in communication with the buffer space and a positioning hole above and in communication with the accommodating hole, the filter element being received in the accommodating hole, the receiver further comprising a retaining plate at least partly received in the positioning hole, and the receiver further comprises a limiting portion located under the retaining plate and configured to prevent the retaining plate from inclining towards the filter element.