A developing device includes a developer accommodating container, a developer carrier, an exhaust path, a capturing member, and a closing member. The developer accommodating container accommodates a developer. The developer carrier is disposed in an opening of the developer accommodating container to be rotated while facing an image carrier, and carries the developer. The exhaust path exhausts an air in the developer accommodating container to an outside. The capturing member captures a toner in the exhausted air passing through the exhaust path. The closing member includes a base end portion and a tip end portion. The base end portion is held by the developer accommodating container. The tip end portion is sandwiched between the developer accommodating container and the developer carried on the developer carrier, downstream of the opening in a rotation direction of the developer carrier. The closing member closes a gap.