Provided is a liquid developer supply device including a supply roller that rotates and holds liquid developer in a recessed portion formed in an outer circumferential surface to supply the liquid developer to a receiving member, a liquid developer supply unit that supplies liquid developer between a seal member which is in contact with the supply roller on an upstream side in a rotating direction and a regulation member which is in contact with the supply roller on a downstream side, and that forms a liquid developer reservoir, and a supply unit that supplies a cleaning liquid to a contact portion from an upstream side of the contact portion between the supply roller and the seal member, in the rotating direction of the supply roller, such that the cleaning liquid flows down along the seal member due to gravity.