A heat exchange unit of an air conditioning apparatus, comprising: a heat exchanger having a plurality of heat transfer tubes that are disposed along a vertical direction and that extend horizontally, and a plurality of heat transfer fins that are disposed horizontally at intervals and that extend vertically; and a casing having a support part on which the heat exchanger is placed; the heat exchange unit of the air conditioning apparatus further comprising: a spacer member (71, 72, 73) disposed between the heat exchanger and the support part; and a fin crushing prevention member disposed between the spacer member and a lowest-row heat transfer tube, which is the lowest heat transfer tube of the plurality of heat transfer tubes, the fin crushing prevention member having higher rigidity than the heat transfer fins, wherein the fin crushing prevention member has a first fin insertion part extending vertically and horizontally, and the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being inserted between the heat transfer fins, wherein the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being horizontally inserted between the heat transfer fins, the fin crushing prevention member further has a fin insertion base extending in a horizontal direction intersecting an insertion direction of the first fin insertion part from an insertion frontal end part, which is an end part of the first fin insertion part on a front side in the insertion direction, the fin crushing prevention member has a plurality of first fin insertion parts, and the insertion frontal end parts of the first fin insertion parts are joined to each other via the fin insertion base. a heat exchanger having a plurality of heat transfer tubes that are disposed along a vertical direction and that extend horizontally, and a plurality of heat transfer fins that are disposed horizontally at intervals and that extend vertically; and a casing having a support part on which the heat exchanger is placed; the heat exchange unit of the air conditioning apparatus further comprising: a spacer member (71, 72, 73) disposed between the heat exchanger and the support part; and a fin crushing prevention member disposed between the spacer member and a lowest-row heat transfer tube, which is the lowest heat transfer tube of the plurality of heat transfer tubes, the fin crushing prevention member having higher rigidity than the heat transfer fins, wherein the fin crushing prevention member has a first fin insertion part extending vertically and horizontally, and the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being inserted between the heat transfer fins, wherein the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being horizontally inserted between the heat transfer fins, the fin crushing prevention member further has a fin insertion base extending in a horizontal direction intersecting an insertion direction of the first fin insertion part from an insertion frontal end part, which is an end part of the first fin insertion part on a front side in the insertion direction, the fin crushing prevention member has a plurality of first fin insertion parts, and the insertion frontal end parts of the first fin insertion parts are joined to each other via the fin insertion base. a spacer member (71, 72, 73) disposed between the heat exchanger and the support part; and a fin crushing prevention member disposed between the spacer member and a lowest-row heat transfer tube, which is the lowest heat transfer tube of the plurality of heat transfer tubes, the fin crushing prevention member having higher rigidity than the heat transfer fins, wherein the fin crushing prevention member has a first fin insertion part extending vertically and horizontally, and the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being inserted between the heat transfer fins, wherein the fin crushing prevention member is disposed between the lowest-row heat transfer tube and the spacer member (71, 72, 73) by the first fin insertion part being horizontally inserted between the heat transfer fins, the fin crushing prevention member further has a fin insertion base extending in a horizontal direction intersecting an insertion direction of the first fin insertion part from an insertion frontal end part, which is an end part of the first fin insertion part on a front side in the insertion direction, the fin crushing prevention member has a plurality of first fin insertion parts, and the insertion frontal end parts of the first fin insertion parts are joined to each other via the fin insertion base.