A construction machine comprising: an automotive lower traveling structure; an upper revolving structure swingably mounted on said lower traveling structure; and a working mechanism mounted in said upper revolving structure to be capable of tilting up and down; wherein said upper revolving structure comprises: a revolving frame forming a support structure; a counterweight located in a rear side of said revolving frame to act as a weight balance to said working mechanism; a prime mover positioned in a front side of said counterweight and mounted on said revolving frame to drive a hydraulic pump; a prime mover cover including a top surface part covering said prime mover from above and a rear surface part hanging down from a rear end of said top surface part and making contact with a top surface of said counterweight; a lock device provided between said counterweight and said prime mover cover for lockably/unlockably locking said prime mover cover to said counterweight in a state where said prime mover cover is closed; and a rear-view camera provided in said prime mover cover for shooting the backward of said upper revolving structure, characterized in that: a lock device-accommodating recessed portion for accommodating said lock device is provided on said rear surface part of said prime mover cover by recessing said rear surface part toward said prime mover in a position corresponding to said lock device, a camera opening (16C6) is provided in an upper position of said lock device-accommodating recessed portion, and said rear-view camera is mounted to an inner surface side of said prime mover cover in a position corresponding to said camera opening (16C6). an automotive lower traveling structure; an upper revolving structure swingably mounted on said lower traveling structure; and a working mechanism mounted in said upper revolving structure to be capable of tilting up and down; wherein said upper revolving structure comprises: a revolving frame forming a support structure; a counterweight located in a rear side of said revolving frame to act as a weight balance to said working mechanism; a prime mover positioned in a front side of said counterweight and mounted on said revolving frame to drive a hydraulic pump; a prime mover cover including a top surface part covering said prime mover from above and a rear surface part hanging down from a rear end of said top surface part and making contact with a top surface of said counterweight; a lock device provided between said counterweight and said prime mover cover for lockably/unlockably locking said prime mover cover to said counterweight in a state where said prime mover cover is closed; and a rear-view camera provided in said prime mover cover for shooting the backward of said upper revolving structure, characterized in that: a lock device-accommodating recessed portion for accommodating said lock device is provided on said rear surface part of said prime mover cover by recessing said rear surface part toward said prime mover in a position corresponding to said lock device, a camera opening (16C6) is provided in an upper position of said lock device-accommodating recessed portion, and said rear-view camera is mounted to an inner surface side of said prime mover cover in a position corresponding to said camera opening (16C6). a revolving frame forming a support structure; a counterweight located in a rear side of said revolving frame to act as a weight balance to said working mechanism; a prime mover positioned in a front side of said counterweight and mounted on said revolving frame to drive a hydraulic pump; a prime mover cover including a top surface part covering said prime mover from above and a rear surface part hanging down from a rear end of said top surface part and making contact with a top surface of said counterweight; a lock device provided between said counterweight and said prime mover cover for lockably/unlockably locking said prime mover cover to said counterweight in a state where said prime mover cover is closed; and a rear-view camera provided in said prime mover cover for shooting the backward of said upper revolving structure, characterized in that: a lock device-accommodating recessed portion for accommodating said lock device is provided on said rear surface part of said prime mover cover by recessing said rear surface part toward said prime mover in a position corresponding to said lock device, a camera opening (16C6) is provided in an upper position of said lock device-accommodating recessed portion, and said rear-view camera is mounted to an inner surface side of said prime mover cover in a position corresponding to said camera opening (16C6). a lock device-accommodating recessed portion for accommodating said lock device is provided on said rear surface part of said prime mover cover by recessing said rear surface part toward said prime mover in a position corresponding to said lock device, a camera opening (16C6) is provided in an upper position of said lock device-accommodating recessed portion, and said rear-view camera is mounted to an inner surface side of said prime mover cover in a position corresponding to said camera opening (16C6).