A developing device includes a first developer carrying member for forming a toner image on an image bearing member; a second developer carrying member for forming the toner image on the image bearing member; a supporting member for rotatably supporting the first developer carrying member; a swingable member for swinging the second developer carrying member about the first developer carrying member; an urging portion for urging the second developer carrying member toward the image bearing member; and a buffering portion, provided so as to press-contact the swingable member, for damping vibration of the swingable member.