A construction machine comprising: a plurality of hydraulic actuators (5,6,7); a plurality of operation levers corresponding to the plurality of hydraulic actuators; a plurality of operation lever devices outputting electric operation signals in accordance with operation amounts of the plurality of operation levers; a plurality of solenoid proportional valves (41a,41b,42a-42d,43a-43d,44a,44b) connected to a hydraulic circuit driving each of the plurality of hydraulic actuators (5,6,7); and a controller inputting therein the operation signals and computing control signals for the solenoid proportional valves and outputting the control signals; and the controller includes: a lever neutrality determination section determining whether or not the operation levers are at a neutral position based on operation signals from the operation lever devices; a pilot pressure computing section computing pilot pressures driving the hydraulic actuators based on the operation signals from the operation lever devices; a command current computing section converting pilot pressure signals computed by the pilot pressure computing section to current signals to the solenoid proportional valves; and a current interruption control section controlling interruption and communication of the current signals from the command current computing section to the solenoid proportional valves; characterized in that the controller includes an operation state determination section determining whether the construction machine is in a manual operation state in which all of the plurality of hydraulic actuators are an object of manual operation by an operator, or in a semiautomatic operation state in which, based on a positional relationship between a bucket claw tip position and a construction target surface, at least one hydraulic actuator of the plurality of hydraulic actuators is controlled to assist the operation of the operator, in a case where the operation state determination section determines that the construction machine is in the semiautomatic operation state, the current interruption control section interrupts the current signals to all of the plurality of solenoid proportional valves only when it is determined that all the operation levers of the plurality of operation lever devices are at the neutral position, wherein in a case where the operation state determination section determines that the construction machine is in the semiautomatic operation state, the current interruption control section does not interrupt the current signals to all of the plurality of solenoid proportional valves even if, with respect to at least one of hydraulic actuators of a boom cylinder and an arm cylinder, the operation lever of the corresponding operation lever device is determined to be at the neutral position, when all the operation levers of the other operation lever devices are not determined to be at the neutral position. the controller includes: a lever neutrality determination section determining whether or not the operation levers are at a neutral position based on operation signals from the operation lever devices; a pilot pressure computing section computing pilot pressures driving the hydraulic actuators based on the operation signals from the operation lever devices; a command current computing section converting pilot pressure signals computed by the pilot pressure computing section to current signals to the solenoid proportional valves; and a current interruption control section controlling interruption and communication of the current signals from the command current computing section to the solenoid proportional valves; characterized in that the controller includes an operation state determination section determining whether the construction machine is in a manual operation state in which all of the plurality of hydraulic actuators are an object of manual operation by an operator, or in a semiautomatic operation state in which, based on a positional relationship between a bucket claw tip position and a construction target surface, at least one hydraulic actuator of the plurality of hydraulic actuators is controlled to assist the operation of the operator, in a case where the operation state determination section determines that the construction machine is in the semiautomatic operation state, the current interruption control section interrupts the current signals to all of the plurality of solenoid proportional valves only when it is determined that all the operation levers of the plurality of operation lever devices are at the neutral position, wherein in a case where the operation state determination section determines that the construction machine is in the semiautomatic operation state, the current interruption control section does not interrupt the current signals to all of the plurality of solenoid proportional valves even if, with respect to at least one of hydraulic actuators of a boom cylinder and an arm cylinder, the operation lever of the corresponding operation lever device is determined to be at the neutral position, when all the operation levers of the other operation lever devices are not determined to be at the neutral position.