A construction machine comprising: a vehicle body (2, 4) having an operators seat; a prime mover which is provided on said vehicle body (2, 4) and is a power source; a hydraulic pump driven by said prime mover and supplying a pressurized oil; a hydraulic actuator (5E - 5H) driven by the pressurized oil supplied from said hydraulic pump; and a lock device capable of switching between a lock position prohibiting the driving of said hydraulic actuator (5E - 5H) and an unlock position allowing the driving of said hydraulic actuator (5E - 5H), a start switch for starting said prime mover, a wireless authentication device provided on said vehicle body (2, 4) and performing wireless authentication with a portable key device, and a vehicle body controller provided for starting said prime mover based on an operation of said start switch and authentication by said wireless authentication device; and wherein the vehicle body controller is adapted, when said lock device is switched to the unlock position, in the case that said portable key device is within an authenticable range of said wireless authentication device, to allow driving of said hydraulic actuator (5E - 5H), and in the case that said portable key device is outside of the authenticable range of said wireless authentication device, to prohibit driving of said hydraulic actuator (5E - 5H), characterized in that said vehicle body comprises an automotive lower traveling structure and an upper revolving structure rotatably mounted on the lower traveling structure; and the authenticable range of said wireless authentication device is set to a revolving range of said upper revolving structure. a vehicle body (2, 4) having an operators seat; a prime mover which is provided on said vehicle body (2, 4) and is a power source; a hydraulic pump driven by said prime mover and supplying a pressurized oil; a hydraulic actuator (5E - 5H) driven by the pressurized oil supplied from said hydraulic pump; and a lock device capable of switching between a lock position prohibiting the driving of said hydraulic actuator (5E - 5H) and an unlock position allowing the driving of said hydraulic actuator (5E - 5H), a start switch for starting said prime mover, a wireless authentication device provided on said vehicle body (2, 4) and performing wireless authentication with a portable key device, and a vehicle body controller provided for starting said prime mover based on an operation of said start switch and authentication by said wireless authentication device; and wherein the vehicle body controller is adapted, when said lock device is switched to the unlock position, in the case that said portable key device is within an authenticable range of said wireless authentication device, to allow driving of said hydraulic actuator (5E - 5H), and in the case that said portable key device is outside of the authenticable range of said wireless authentication device, to prohibit driving of said hydraulic actuator (5E - 5H), characterized in that said vehicle body comprises an automotive lower traveling structure and an upper revolving structure rotatably mounted on the lower traveling structure; and the authenticable range of said wireless authentication device is set to a revolving range of said upper revolving structure.