The present disclosure provides an acceleration sensing structure including a base frame, a proof mass, a gimbal and at least two outer flexible arms. The proof mass is suspended from the base frame and has a first thickness. The gimbal connects and surrounds the proof mass. The gimbal has a second thickness. Each of the at least two outer flexible arms are connected between the gimbal and the base frame, and the at least two outer flexible arms are arranged symmetrically. The second thickness is larger than or equal to one-half of the first thickness and is smaller than or equal to the first thickness. When the proof mass is moved, the gimbal and the at least two outer flexible arms deform. Therefore, the performance of the acceleration sensing structure can be improved. |