A mechanical shutter includes a base including a plate with an aperture and a protruding positioning projection. A core on the surface surrounds the aperture and includes a first end and a second end. The positioning projection is arranged between the first end and the second end, on one corner of the surface. A coil surrounds the core and a blade and a permanent magnet are pivoted on the positioning projection. When receiving current, the coil magnetizes to the core to generate a magnetic force and rotates the permanent magnet, and the blade, to cover and expose the aperture. An electronic device having the mechanical shutter is also provided.