A construction machine comprising: an undercarriage ; an upperstructure that is turnably provided on the undercarriage and has a turning frame including a center frame and side frames provided on the right and the left of the center frame ; an engine room that is provided on the upperstructure ; a reducing agent tank that is disposed in a radiator space adjacent to the engine room , and stores a reducing agent; an engine , a cooling fan that rotates by driving of the engine , an injector that injects the reducing agent to exhaust gas exhausted from the engine , and a reducing agent hose that connects the injector and the reducing agent tank , which are provided in the engine room ; and a heat exchanger that is disposed between the reducing agent tank and the cooling fan , performs heat exchange by cooling air generated by rotation of the cooling fan to cool the engine , characterized in that the construction machine further comprises a bracket for placing the heat exchanger , the bracket being mounted on a side frame of the turning frame and being composed of a strength member having a cross-section substantially of a downwardly opened U-shape, the strength member having a first side plate section facing a side of the radiator space on which the reducing agent tank is disposed, a second side plate section facing an inside of the engine room , and a top plate section connecting the first side plate section and the second side plate section , wherein a first cutout section for allowing the reducing agent hose to be inserted, and a second cutout section for allowing the reducing agent hose to be inserted are provided in the first side plate section and the second side plate section respectively, and a portion of the reducing agent hose is disposed to pass through the first cutout section , through an internal space (SP3) of the bracket and through the second cutout section . an undercarriage ; an upperstructure that is turnably provided on the undercarriage and has a turning frame including a center frame and side frames provided on the right and the left of the center frame ; an engine room that is provided on the upperstructure ; a reducing agent tank that is disposed in a radiator space adjacent to the engine room , and stores a reducing agent; an engine , a cooling fan that rotates by driving of the engine , an injector that injects the reducing agent to exhaust gas exhausted from the engine , and a reducing agent hose that connects the injector and the reducing agent tank , which are provided in the engine room ; and a heat exchanger that is disposed between the reducing agent tank and the cooling fan , performs heat exchange by cooling air generated by rotation of the cooling fan to cool the engine , characterized in that the construction machine further comprises a bracket for placing the heat exchanger , the bracket being mounted on a side frame of the turning frame and being composed of a strength member having a cross-section substantially of a downwardly opened U-shape, the strength member having a first side plate section facing a side of the radiator space on which the reducing agent tank is disposed, a second side plate section facing an inside of the engine room , and a top plate section connecting the first side plate section and the second side plate section , wherein a first cutout section for allowing the reducing agent hose to be inserted, and a second cutout section for allowing the reducing agent hose to be inserted are provided in the first side plate section and the second side plate section respectively, and a portion of the reducing agent hose is disposed to pass through the first cutout section , through an internal space (SP3) of the bracket and through the second cutout section . <EOS>