A wearable electronic device including a body having a first locking recess, a wearable element having a second locking recess and a locking structure disposed in one of the first and the second locking recesses and including a pressing element and a locking element connected with each other is provided. The locking element is adapted to lock another one of the first locking recess and the second locking recess to assemble the body and the wearable element together, and the pressing element is adapted to receive an external force and move along a vertical axial direction into the first locking recess or the second locking recess which the locking structure is located, and drive the locking element to move along a horizontal axial direction into the first locking recess or the second locking recess which the locking structure is located, so as to unlock the body and the wearable element.