CONSTRUCTION MACHINE

[Problem] The present invention has been made in view of the above problem; it is an object of the present invention to simplify, in an electrically controlled construction machine, a wiring of a wire harness between a controller and a control valve.[Solution] On a turn frame 7 of an excavation machine 1, a hydraulic oil tank 48 is placed in the center of a right engine chamber 9a in the front-back direction, a control valve 45 is placed in front of the hydraulic oil tank 48, a battery 49 is further placed in front of the control valve 45, and a cool mechanism 60 is placed behind the hydraulic oil tank 48. The controller 51, which outputs a signal to drive the control valve 45, is placed opposite the hydraulic oil tank 48.