Patent ID: 8407991

Claim:
A construction machine having a working attachment, said construction machine comprising: a base frame for supporting said working attachment so as to be raised and lowered; an engine installed on said base frame; an exhaust gas after-treatment device to purify exhaust gas from said engine while the exhaust gas flows therethrough; and a guard panel installed over said base frame so as to cover said engine and said exhaust gas after-treatment device, wherein said exhaust gas after-treatment device includes a first treatment section having a filter to collect dust contained in the exhaust gas from said engine and a second treatment section having a catalyst for decomposing nitrogen oxides contained in the exhaust gas treated by said first treatment section, said guard panel includes a top plate, said top plate being disposed in parallel with said base frame and having an opening in a portion thereof corresponding to said engine, and a bonnet formed so as to project upwards from said top plate and cover said opening, one of said first and second treatment sections is disposed lower than said top plate, and at least a part of the other treatment section is disposed higher than said top plate through said opening and lower than said bonnet.