a scent diffuser includes a holder configured to hold a replaceable scent member , the holder having at least one discharge port configured to discharge scent emitted from the scent member . the scent diffuser further includes a slider with a manipulation part accessible to a user , the slider being configured to move relative to the holder based on force applied by the user to the manipulation part , and the manipulation part being configured to transmit force to the slider , thereby causing the slider to move . the slider is configured to adjust an extent of an opening of the discharge port based on a position to which the slider is moved .