An emblem-unified trunk opening and closing device may include a housing including an outer case and an inner case, wherein the outer case is attached to a stationary member and includes a guide hole and the inner case includes a guide passage, a knob attached to the outer case of the housing, wherein the knob includes an emblem configured to be movable through the guide hole of the outer case, a connector provided in the guide passage of the inner case and to which a terminal electrically contacting an outer electric source is set, a printed circuit board (“PCB”) disposed inside the guide passage of the inner case and configured to electrically contact the terminal, and a contact unit configured to selectively contact the PCB by actuation force of the emblem so as to apply an electric current to the terminal of the connector.