A construction machine according to the present invention comprises a maintenance opening portion formed extending over a front shielding plate of a seat stand adjacent to a control stand and a side shielding plate of the control stand, or a maintenance opening portion formed extending over the front shielding plate and an upper shielding plate connected to an upper part of the front shielding plate. Further, the construction machine comprises a maintenance cover for dosing the opening portion. According to such a structure, workability of the maintenance work of the construction machine can be improved.