An air conditioning unit, comprising: a fan , which is rotatable about an axis (A) thereof; and a heat exchanger , which is arranged at a position shifted relative to the fan in an axial direction of the fan , the heat exchanger being arranged in an imaginary setting plane (B) surrounding the axis (A), the heat exchanger being segmented into three or more heat exchange sections which are provided respectively in three or more regions arrayed in the axial direction of the fan , wherein, assuming that a direction along the imaginary setting plane (B) on a plane perpendicular to the axis (A) is a peripheral direction of the imaginary setting plane (B), among lengths of the plurality of heat exchange sections along the peripheral direction of the imaginary setting plane (B), a length of the heat exchange section which is present in a region closer to the fan is longer, the air-conditioning unit further comprising a casing configured to accommodate the fan and the heat exchanger , the casing comprising a plurality of side panels surrounding the axis (A) of the fan , at least any one of the plurality of side panels comprising a panel shielding section configured to block passage of an air flow, the panel shielding section being configured to cover an area in which the heat exchanger is absent in a rotation direction of the fan , wherein the panel shielding section has an access port for allowing access from an outside of the casing to an inside of the casing , and wherein the access port is positioned in the region farther away from the fan than the region closest to the fan . a fan , which is rotatable about an axis (A) thereof; and a heat exchanger , which is arranged at a position shifted relative to the fan in an axial direction of the fan , the heat exchanger being arranged in an imaginary setting plane (B) surrounding the axis (A), the heat exchanger being segmented into three or more heat exchange sections which are provided respectively in three or more regions arrayed in the axial direction of the fan , the heat exchanger being arranged in an imaginary setting plane (B) surrounding the axis (A), the heat exchanger being segmented into three or more heat exchange sections which are provided respectively in three or more regions arrayed in the axial direction of the fan , wherein, assuming that a direction along the imaginary setting plane (B) on a plane perpendicular to the axis (A) is a peripheral direction of the imaginary setting plane (B), among lengths of the plurality of heat exchange sections along the peripheral direction of the imaginary setting plane (B), a length of the heat exchange section which is present in a region closer to the fan is longer, the air-conditioning unit further comprising a casing configured to accommodate the fan and the heat exchanger , the casing comprising a plurality of side panels surrounding the axis (A) of the fan , at least any one of the plurality of side panels comprising a panel shielding section configured to block passage of an air flow, the panel shielding section being configured to cover an area in which the heat exchanger is absent in a rotation direction of the fan , wherein the panel shielding section has an access port for allowing access from an outside of the casing to an inside of the casing , and wherein the access port is positioned in the region farther away from the fan than the region closest to the fan . <EOS>