Work machine including battery

A work machine comprising:

• a lower crawling body;
• an upper slewing body slewably mounted on the crawler-type lower crawling body, the upper slewing body including a machine room;
• a fuel tank accommodated in the machine room, the fuel tank having a main body portion and an upper extension portion extending upward from a part of a region of the main body portion, the upper extension portion including a tank upper surface and a fuel-filler portion protruding upward beyond the tank upper surface;
• a battery accommodated in the machine room and disposed adjacent the fuel-filler portion at a lateral side of the upper extension portion, the battery including a battery upper surface;
• and
• a cover member accommodated in the machine room,
• the cover member including a cover portion which covers the battery upper surface and an extension portion which continuously extends from the cover portion toward the fuel-filler portion and covers a region from the battery to the fuel-filler portion, the extension portion including a hang-down portion which hangs down from the cover portion at a position between the battery and the fuel-filler portion and a protruded portion protruded from a lower end of the hang-down portion toward the fuel-filler-portion, wherein
• the protruded portion has a fitting hole having a shape to allow the fuel filler portion to be fitted into the fitting hole so as to vertically penetrate the protruded portion, the protruded portion thus being supported on the tank upper surface around the fuel-filler portion.