An adjust device for adjusting a tension of a snare of a snare drum includes a body laterally secured on a periphery of the snare drum. A slider is movably received in the body and one end of the snare is secured on the slider so that the tension of the snare is adjusted when the slider is moved. An adjuster is partially screwed into the body for adjusting the stroke of the slider. An actuated device includes a shaft having a first end extending through the adjuster and connected to the slider for driving the slider. A lever is pivotally connected to a second end of the shaft for lifting the shaft and the slider to pull the snare of the snare drum.