Abstract: A scroll saw includes a hollow elongated base having a vertical sleeve portion at the rear end portion of the base. A hollow shaft is slidably inserted in the sleeve portion. An L-shaped arm member is fixed to the hollow shaft and has a suspending bracket which hangs over the base. A worktable is horizontally above and has a lengthwise extending elongated slot. A guide screw rod has a first end connected to a hand wheel, and a second end vertically passing through the L-shaped arm member and a horizontal plate fixed to the base. Therefore, the L-shaped arm member can be moved up and down by rotating the hand wheel. Parallel driven and driving levers are respectively pivoted to the suspending bracket and the base. An elongated linking member has a first end pivoted to the driven lever and a second end extending into the hollow shaft. A longitudinal hole is formed near the second end of the linking member and has transverse positioning holes connected to the longitudinal hole.