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.