Construction machine

A construction machine comprising:

• a support frame forming a support structural member for a traveling structure of the construction machine;
• an engine mounted at a rear side of said support frame;
• a cab positioned at a front side of said support frame and arranged on one side of right and left directions of said support frame and into which cab an operator can board;
• an oil reservoir tank arranged on said support frame on an other side of the right and left directions thereof for reserving one of fuel to be supplied to said engine and operating oil to be used in a hydraulic system of the construction machine;
• an article accommodating box provided on said support frame and positioned forward of a front side of said oil reservoir tank;
• a NOx purifying device provided in an exhaust pipe of said engine and equipped with a urea selective reduction catalyst for removing nitrogen oxides in an exhaust gas;
• a urea water tank formed of a hollow container for reserving urea water usable as a reducing agent in said NOx purifying device;
• and
• a connecting pipe between said urea water tank and said exhaust pipe of said engine, said construction machine characterized in that:
• said oil reservoir tank is formed having one of an angular tubular side surface plate and a cylindrical side surface plate forming an outer peripheral surface of said oil reservoir tank, a bottom surface plate closing a bottom surface of said side surface plate, and a top surface plate closing a top surface of said side surface plate and including a flange portion extending to an outside in relation to said side surface plate;
• a surplus space portion being formed in a side of the outer peripheral surface of said side surface plate to be projected in upper and lower directions in a range of said flange portion of said top surface plate;
• said urea water tank being arranged, with respect to said oil reservoir tank, in such a manner as to enter into said surplus space portion formed between said front side of said oil reservoir tank and said article accommodating box;
• and
• a front cover which covers said urea water tank and by which said urea water tank is concealed from outside, said front cover being provided between said oil reservoir tank and said article accommodating box.