The present invention provides a developing device that is provided with: a developer containing a toner and a carrier; a first transporting member placed at an opening portion of a developer vessel used for housing the developer; a second transporting member that faces the first transporting member with a first area interposed therebetween, and also faces an electrostatic latent image-supporting member with a second area interposed therebetween; a first electric-field-forming unit that forms a first electric field between the first transporting member and the second transporting member; and a second electric-field-forming unit that forms a second electric field between the second transporting member and the electrostatic latent image-supporting member, and in this structure, the first electric field, formed between the first transporting member and the second transporting member, includes at least an ac electric field, and the second transporting member has a surface that is charged to the same polarity as the charged polarity of the toner when made in friction-contact with the carrier, with a volume resistance value of 1.times.10.sup.3 to 1.times.10.sup.9 (.OMEGA.). The present invention also provides an image-forming apparatus including the above-mentioned developing device.