The present disclosure discloses an actuating mechanism disposed in an electronic device, which includes an opening. The actuating mechanism comprises a moving member, a first lever, a second lever, a first shape memory alloy member and a second shape memory alloy member. The moving member corresponds to the opening and has a first limiting slot and a second limiting slot. The first lever has a first minor axis and a first major axis, and one end of the first major axis connects to the first limiting slot. The second lever has a second minor axis and a second major axis, and one end of the second major axis connects to the second limiting slot. One end of the first shape memory alloy member connects to the first minor axis. One end of the second shape memory alloy member connects to the second minor axis.