CONSTRUCTION MACHINE

A regeneration device (22) performs regeneration of a filter (21) by burning particulate matter trapped by the filter (21) of an exhaust gas purifying device (18). The regeneration device (22) is configured to perform two types of processing, that is, automatic regeneration processing for automatically performing regeneration not on the basis of an operation by an operator and manual regeneration processing for performing regeneration by notifying an operator to manually perform the regeneration and by performing the regeneration on the basis of an operation by the operator. The automatic regeneration processing makes determination on whether or not to perform regeneration on the basis of an estimated trapping amount (H) estimated from an engine rotational speed (N) and a fuel injection quantity (F). The manual regeneration processing makes determination on whether or not to notify the operator on the basis of a differential pressure (P) of the particulate matter removing filter (21).