Patent ID: 8733824

Claim:
A construction machine comprising an upper slewing body, the upper slewing body including: a frame bottom plate forming a bottom wall of the upper slewing body and formed with an opening opened downwardly; an undercover detachably attached to the frame bottom plate so as to close up the opening; and a connection member for connecting the undercover to the frame bottom plate, wherein the undercover includes a cover-forming member made of a single plate fabricated so as to have a base portion extending along a lower surface of the frame bottom plate and a bulging portion bulging upwardly from the base portion and adapted to be inserted into the opening, the base portion having a contact area located in an outer edge region of the base portion so as to be connected to the frame bottom plate while making contact with the lower surface of the frame bottom plate from a lower side thereof, and wherein the connection member has a first portion fixed to an upper surface of an inner edge region of the frame bottom plate, the inner edge region defining the opening, and a second portion protruding beyond the opening-defining inner edge region of the frame bottom plate inwardly of the opening and occupying only a part of the opening to allow the other part of the opening to remain open, the second portion being adapted to connect the bulging portion to a region of the frame bottom plate, the region being located above the lower surface of the frame bottom plate, while making contact with an upper surface of the bulging portion from an upper side thereof.