CONSTRUCTION MACHINE

A regeneration apparatus (35, 36) for executing a regeneration process to an exhaust gas purifying apparatus (16) and an engine control device (34) that controls a rotational speed of an engine (10) according to an instruction value by a rotational speed instruction apparatus (29) are provided. When a directional control valve (25) is in a neutral position, the engine control device (34) controls the rotational speed of the engine (10) to an automatic idle rotational speed (Nai) by an automatic idle selection unit (30) regardless of the instruction value. However, when it is determined that the regeneration process of the exhaust gas purifying apparatus (16) is executed in a state of controlling the rotational speed of the engine (10) at the automatic idle rotational speed (Nai), the engine control device (34) increases the rotational speed of the engine (10) to a regeneration processing rotational speed (N1) higher than the automatic idle rotational speed (Nai).