The present invention relates to a safety device for an escalator, which can safely move a person or cart on a moving step of the escalator or a moving walkway toward a platform, the safety device comprising: a tilting member comprising a free end portion extended from a front end portion of a platform member, which covers an upper surface of a moving step getting thereunder in an end region of the escalator, toward an upper surface of an entering moving step, and a rotary end portion rotatably installed under the platform member; a contact roller installed in a region of the free end portion and rotatable being in contact with the moving step; and at least one guide roller rotatable being in contact with the contact roller and partially exposed through the upper surface.