A reducing agent tank (11) is disposed in a first space (SP1) on an upstream side of cooling air with respect to a heat exchanger (21), and an engine (13) and an injector (14) are disposed in a second space (SP2) on a downstream side of the cooling air with respect to the heat exchanger (21). The heat exchanger is placed on a bracket (30) having a first side plate section (32), a second side plate section (33), and a top plate section (31), and a first cutout section (34) for allowing a reducing agent hose (25) to be inserted, a second cutout section (35) 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 passes through the first cutout section and the second cutout section to be wired in an internal space (SP3) of the bracket.