Working machine

A working machine comprising:

• a machine body having a front-rear direction and a right-left direction perpendicular to the front-rear direction, the machine body having a rear part in the front-rear direction and having a right side and a left side opposite to the right side in the right-left direction;
• a cabin mounted in the machine body between the right side and the left side;
• a right traveling device arranged on the right side of the machine body;
• a left traveling device arranged on the left side of the machine body;
• a boom having a front end part and a rear end part opposite to the front end part of the boom in the front-rear direction, the rear end part of the boom being rotatably supported at the rear part of the machine body, the front end part of the boom being to be connected to a working tool;
• an engine mounted in the rear part of the machine body;
• a urea aqueous solution tank provided on one side of the engine in the right-left direction and a rear side of the engine in the front-rear direction to store a urea aqueous solution;
• a third wall positioned on a rear side of the urea aqueous solution tank in the front-rear direction;
• a fifth wall positioned on a front side of the urea aqueous solution tank in the front-rear direction;
• and
• a second wall provided between the third wall and the fifth wall on one side of the urea aqueous solution tank in the right-left direction, the second wall, the third wall, and the fifth wall defining an installment portion in which the urea aqueous solution tank is installed.

A working machine comprising:

• a machine body having a front-rear direction and a right-left direction perpendicular to the front-rear direction, the machine body having a rear part in the front-rear direction and having a right side and a left side opposite to the right side in the right-left direction;
• a cabin mounted in the machine body between the right side and the left side;
• a right traveling device arranged on the right side of the machine body;
• a left traveling device arranged on the left side of the machine body;
• a boom having a front end part and a rear end part opposite to the front end part of the boom in the front-rear direction, the rear end part of the boom being rotatably supported at the rear part of the machine body, the front end part of the boom being to be connected to a working tool;
• an engine mounted in the rear part of the machine body;
• a urea aqueous solution tank provided on one side of the engine in the right-left direction and a rear side of the engine in the front-rear direction to store a urea aqueous solution;
• the machine body having an up-down direction perpendicular to the front-rear direction and to the right-left direction;
• a radiator provided on a upper side of the engine in the up-down direction;
• a first wall provided on one side of the urea aqueous solution tank in the left-right direction;
• a second wall provided on another side opposite to the one side with respect to the urea aqueous solution tank;
• a third wall positioned on a rear side of the urea aqueous solution tank in the front-rear direction;
• and
• a fifth wall positioned on a front side of the urea aqueous solution tank in the front-rear direction, the first wall, the second wall, the third wall, and the fifth wall defining an installment portion in which the urea aqueous solution tank is installed.