Rough terrain crane

A rough terrain crane comprising:

• a lower carrier having a front axle and a rear axle;
• a boom device disposed above the lower carrier;
• and
• a single operating unit that performs driving and a boom operation via a hydraulic actuator,
• wherein the lower carrier includes a lower frame, an outrigger provided to be attached and detached to an end portion of the lower frame, and an engine that is disposed on an upper side of a rear end portion of the lower carrier, drives the axles, and supplies hydraulic pressure to the hydraulic actuator, and an elevating step,
• the rough terrain crane further comprising:
• an exhaust emission control device that has a diesel oxidation catalyst which is connected to an exhaust pipe extending from the engine and is supplied with exhaust, a decompression reactor tube disposed downstream of the diesel oxidation catalyst, and a selective catalyst reduction disposed downstream of the decompression reactor tube,
• wherein the diesel oxidation catalyst, the decompression reactor tube, and the selective catalyst reduction are disposed in parallel on a virtual horizontal plane separated from a top surface of the lower carrier by a predetermined distance, and
• wherein the elevating step is disposed in a gap that is formed between the top surface of the lower carrier and the exhaust emission control device.