An exhaust emission control device comprising: a diesel oxidation catalyst and a soot filter; a purification casing comprising a plurality of purification cases respectively housing the diesel oxidation catalyst and the soot filter; an exhaust gas pressure sensor configured to detect an exhaust gas pressure in the purification casing; and an exhaust gas temperature sensor configured to detect an exhaust gas temperature in the purification casing, wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed along an outer circumferential side of the purification casing in an exhaust gas flow direction, characterized in that: a sensor bracket is detachably secured to a sensor support portion disposed on a part of flanges (59, 60, 73, 74) of a group of the purification cases, and the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed on the sensor bracket wherein the sensor support portion is disposed on a part of the flange in the group of the purification cases that is farthermost from an exhaust gas inlet side, wherein a horizontal plate portion of the sensor bracket is located at a position outwardly separated from an outer circumferential side of the purification casing, and wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed side by side on the horizontal plate portion, wherein coupling directions of a wiring connector for the exhaust gas pressure sensor and a wiring connector for the exhaust gas temperature sensor are oriented in the same direction. a diesel oxidation catalyst and a soot filter; a purification casing comprising a plurality of purification cases respectively housing the diesel oxidation catalyst and the soot filter; an exhaust gas pressure sensor configured to detect an exhaust gas pressure in the purification casing; and an exhaust gas temperature sensor configured to detect an exhaust gas temperature in the purification casing, wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed along an outer circumferential side of the purification casing in an exhaust gas flow direction, characterized in that: a sensor bracket is detachably secured to a sensor support portion disposed on a part of flanges (59, 60, 73, 74) of a group of the purification cases, and the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed on the sensor bracket wherein the sensor support portion is disposed on a part of the flange in the group of the purification cases that is farthermost from an exhaust gas inlet side, wherein a horizontal plate portion of the sensor bracket is located at a position outwardly separated from an outer circumferential side of the purification casing, and wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed side by side on the horizontal plate portion, a sensor bracket is detachably secured to a sensor support portion disposed on a part of flanges (59, 60, 73, 74) of a group of the purification cases, and the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed on the sensor bracket wherein the sensor support portion is disposed on a part of the flange in the group of the purification cases that is farthermost from an exhaust gas inlet side, wherein a horizontal plate portion of the sensor bracket is located at a position outwardly separated from an outer circumferential side of the purification casing, and wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are disposed side by side on the horizontal plate portion, wherein coupling directions of a wiring connector for the exhaust gas pressure sensor and a wiring connector for the exhaust gas temperature sensor are oriented in the same direction.