PURPOSE: To provide the switch mechanism of an electric power tool, by which a main switch lever and a safety switch lever can be operated by one hand and the switches are not operated in a wrong order.

CONSTITUTION: Two micro-switches 11 and 12 are disposed to rotate a motor when both micro-switches are turned on at the same time in a case formed in such a way as storing a driving mechanism such as a motor, a speed change mechanism and so on and a tool head and as being portable Further, there are provided with a main switch lever 6 for on-off operating one micro-switch by an index finger, a safety switch lever 7 for on-off operating the other micro- switch by a thumb and the vicinity of the root of the index finger and a hammer lever 8 for installing a workpiece on a tool head 9, which is installed above the safety switch 7 and operated by the thumb.