A cleaning device includes: a cleaning blade which removes liquid developer including toner particles and carrier liquid by bringing a contact corner portion constituted by a first surface and a second surface into contact with a cleaned body which is rotated or circulated while holding the liquid developer; a blade supporting body which supports the cleaning blade at the first surface of the cleaning blade or a surface on the side opposite to the first surface; a pressing member which presses the contact corner portion of the cleaning blade against the cleaned body; and seal members disposed at side ends in the first direction of the cleaning blade and having projecting portions which project further than the second surface on the side opposite to a third surface which is on the side opposite to the second surface.