Construction Machine

A tank bracket () is formed by a bottom surface part () having a first frame body (A), a second frame body (B), a third frame body (C), and a fourth frame body (D), a first side surface part () supported by the first frame body (A) of the bottom surface part () and provided in a vertical direction, and a second side surface part () supported by the second frame body (B) and provided in the vertical direction, and a female screw hole (E) is provided in the bottom surface part (). A fixing band () for fixing a reduction agent tank () is provided on the tank bracket (). On this, the tank bracket () is fixed to an undercover () of a revolving frame () by using each of the female screw holes (E) of the bottom surface part () in a state in which the reduction agent tank () is sandwiched between the second side surface part () and a right side frame () of the revolving frame ().