A power tool comprising: a power source; a tip tool configured to be driven by the power source; a first micro switch and a second micro switch configured to be turned on for activating the power source, the power source being activated if both the first micro switch and the second micro switch are turned on; a main handle having a first switch lever configured to be operated by an operator, the first micro switch being turned on or off as the first switch lever is operated; a sub-handle having a second switch lever configured to be operated by the operator, the second micro switch being turned on or off as the second switch lever is operated; a control means configured to control the power source in accordance with on/off of the first micro switch and the second micro switch; and an auxiliary function configured to be activated by the control means, characterized in that the control means comprises: a control circuit configured to control the power source; a power supply circuit configured to supply electric power to the control circuit; a first detecting circuit configured to detect that the first micro switch is turned on or off; and a second detecting circuit configured to detect that the second micro switch is turned on or off, and a discriminating circuit configured to determine whether any of the first micro switch and the second micro switch is turned on or off based on the detection results of the first detecting circuit and the second detecting circuit; and a drive circuit configured to switch on a switching element to provide power from the power source to drive the tip tool; wherein the control means operates to activate the auxiliary function if the first micro switch is turned on and the second micro switch is not turned on and if the second micro switch is turned on and the first micro switch is not turned on, and operates to activate the auxiliary function and to drive the drive circuit if both the first micro switch and the second micro switch are turned on. a power source; a tip tool configured to be driven by the power source; a first micro switch and a second micro switch configured to be turned on for activating the power source, the power source being activated if both the first micro switch and the second micro switch are turned on; a main handle having a first switch lever configured to be operated by an operator, the first micro switch being turned on or off as the first switch lever is operated; a sub-handle having a second switch lever configured to be operated by the operator, the second micro switch being turned on or off as the second switch lever is operated; a control means configured to control the power source in accordance with on/off of the first micro switch and the second micro switch; and an auxiliary function configured to be activated by the control means, characterized in that the control means comprises: a control circuit configured to control the power source; a power supply circuit configured to supply electric power to the control circuit; a first detecting circuit configured to detect that the first micro switch is turned on or off; and a second detecting circuit configured to detect that the second micro switch is turned on or off, and a discriminating circuit configured to determine whether any of the first micro switch and the second micro switch is turned on or off based on the detection results of the first detecting circuit and the second detecting circuit; and a drive circuit configured to switch on a switching element to provide power from the power source to drive the tip tool; wherein the control means operates to activate the auxiliary function if the first micro switch is turned on and the second micro switch is not turned on and if the second micro switch is turned on and the first micro switch is not turned on, and operates to activate the auxiliary function and to drive the drive circuit if both the first micro switch and the second micro switch are turned on. a control circuit configured to control the power source; a power supply circuit configured to supply electric power to the control circuit; a first detecting circuit configured to detect that the first micro switch is turned on or off; and a second detecting circuit configured to detect that the second micro switch is turned on or off, and a discriminating circuit configured to determine whether any of the first micro switch and the second micro switch is turned on or off based on the detection results of the first detecting circuit and the second detecting circuit; and a drive circuit configured to switch on a switching element to provide power from the power source to drive the tip tool; wherein the control means operates to activate the auxiliary function if the first micro switch is turned on and the second micro switch is not turned on and if the second micro switch is turned on and the first micro switch is not turned on, and operates to activate the auxiliary function and to drive the drive circuit if both the first micro switch and the second micro switch are turned on.