Abstract: An electronic microscope includes a handle having an outer body enclosing a main body and an image sensor, a lens controller fixed to the front end of the outer body of the handle, and a light guide coupled to the front end of the lens controller. The lens controller includes an inner case having a guide slot in the circumference and a flange on one end to which the handle is coupled, an outer case rotatably coupled with the inner case from outside and having a spiral passage in the circumference communicating with the guide slot, and a lens unit inserted into the inner case. The lens unit moves back and forth in response to rotation of the outer case. The light guide includes a LED board, LEDs radially mounted on the LED board, and an observation filter detachably provided on the front end of the lens controller.