To provide a technique for suppressing the increase in size of a work tool which drives a tip tool sandwich-held.

By a biasing force of an O-ring 132 or a coil spring 134 arranged outside a spindle 120, an electric vibration tool 100 which holds a clamp shaft 123 arranged inside the spindle 120 is configured. By a thrust pin 140 which moves by revolution of a cam lever 150, the biasing force of the O-ring 132 or the coil spring 134 acting on the clamp shaft 123 is released, and the clamp shaft 123 can be removed. As a result, a blade 200 can be replaced without using a special tool.