Construction machine

A hydraulic excavator comprising:

• a vehicle body having an operator's seat;
• an engine provided on said vehicle body and serving as a power source;
• a hydraulic pump driven by said engine and supplying a pressurized oil;
• a hydraulic actuator driven by the pressurized oil supplied from said hydraulic pump;
• a gate lock lever provided at a position corresponding to an entrance way of said operator's seat and switched between a raised position where said entrance way is opened and driving of said hydraulic actuator is prohibited and a lowered position where said entrance way is closed and the driving of said hydraulic actuator is allowed;
• a gate lock switch provided on said gate lock lever and detecting a position of said gate lock lever;
• a power switch operated at the time of starting said engine;
• a wireless authentication device constituted to transmit an authentication request signal within an authenticable range and, when an authentication signal replied from a portable key device is received on the basis of the transmitted authentication request signal, to perform authentication on whether the authentication signal is valid or not;
• a vehicle body controller allowing or prohibiting start of said engine on the basis of an operation of said power switch and authentication by said wireless authentication device;
• a time setting switch connected to said vehicle body controller, and variably setting authentication holding time by said wireless authentication device;
• a range setting switch connected to said vehicle body controller, and variably setting an authenticable range where said wireless authentication device is capable of performing authentication of said portable key device depending on a use environment;
• and
• a monitor device on which a setting screen of said authentication holding time is displayed when said authentication holding time is to be increased/decreased by using said time setting switch are provided;
• wherein
• said vehicle body controller has a unit for allowing start of said engine by said power switch when a detection signal of said raised position is input from said gate lock switch and a signal of valid authentication indicating that said authentication signal of said portable key device is valid is input from said wireless authentication device;
• said wireless authentication device is constituted to have an authentication controller for holding a state of said valid authentication for said authentication holding time set by said time setting switch when the valid authentication signal is received from said portable key device;
• and
• said time setting switch is made to set said authentication holding time as a predetermined basic time and variably set a rental allowable time or a lease allowable time longer than the basis time.