The present invention provides a safety door. The safety door includes a corner unit which is arranged on a side top of a door rotating in the horizontal direction to be opened or closed and is coupled to a hinge; a door post including a safety groove formed in the vertical direction to let the cornet unit to be partially or entirely inserted to prevent a part of a user′s body from being pressed by the corner unit; and an elastic unit which is arranged in the safety groove to elastically interfere the corner units.
