Patent ID: 7940160

Claim:
A lock control device for a working machine, which locks starting upon a performance of a stop operation of the working machine, and releases the starting lock upon password input via an input unit, comprising: a stop operation detection unit which detects that a predetermined stop operation has been performed by the working machine; a time period length measurement unit which measures a time period length from when it has been detected that said predetermined stop operation has been performed, to the present; a lock setting unit which: if said time period length which has been measured is within a predetermined time period length, makes said locking of said working machine ineffective, and, if the starting of said working machine is requested, makes it possible to restart said working machine without password input; and, if said time period length which has been measured is greater than said predetermined time period length, locks the starting of said working machine, and releases said locking to make it possible to restart said working machine only upon the password input; a time point acquisition unit for acquiring a present time point; and a time period length control unit which: if the present time point is a time point which belongs to a certain time period band, makes said predetermined time period length be a first time period length; and, if the present time point is a time point which does not belong to said certain time period band, makes said predetermined time period length be a second time period length which is different from said first time period length.