An image forming apparatus includes an image carrying member, a charging device, an exposure device, a development device, and a development voltage power supply. The image carrying member has an amorphous silicon photosensitive layer formed on its surface. The development device includes a developer carrying member carrying two-component developer containing toner and carrier. The development voltage power supply applies to the developer carrying member a development voltage having an alternating-current voltage superposed on a direct-current voltage. When the blank part potential on the image carrying member is V0 [V], the direct-current voltage is Vdc [V], the peak-to-peak value of the alternating-current voltage Vac is Vpp [kV], and the gap between the image carrying member and the developer carrying member is Ds [mm], 10V0Vdc90 and 1.2Vpp/Ds3.5 are fulfilled.

An image forming device includes a communication device that communicates with a wireless tag, and an image former that forms a developer image on a surface of a photoreceptor via a transfer belt. The image former includes a transferor that transfers the developer image from the transfer belt to a medium, and a transmitter configured to transmit the medium to the transferor. The image forming device includes a controller communicably coupled to the image former. The controller includes a processor that controls an operation of the transmitter. When communication with the wireless tag by the communication device is not ended, the controller controls the transmitter to stop the medium, and after the developer image has been transferred to the transfer belt by the image former and passes a transfer position of the transferor, transmit the medium preventing the developer image on the transfer belt from being transferred to the medium.

An image forming apparatus according to the present disclosure includes: an image forming portion configured to apply a bias voltage between a first carrier with a surface to be charged and a second carrier configured to hold toner to be adhered to the first carrier to move the toner from the second carrier to a developing area of the first carrier to develop the developing area of the first carrier; a current detection portion configured to detect a target current that flows between the first carrier and the second carrier during development; a temperature detection portion configured to detect a temperature inside the apparatus; and a cooling control portion configured to execute a predetermined cooling operation based on a detected current that is detected by the current detection portion and a detected temperature that is detected by the temperature detection portion.

Magnetic one-component toner has toner particles including: a toner base particle containing at least a binder resin and a magnetic powder; and an external additive attached to the surface of the toner base particle. The toner base particle contains a nigrosine dye. The external additive contains strontium titanate particles of which the surface is hydrophobically treated. The amount of nitrogen element in toner particles is 0.5 mass % or more but 5 mass % or less. The Abs value representing the amount of nigrosine dye that dissolves when toner particles are immersed in methanol as expressed in terms of light absorbance is 0.2 or more but 2.0 or less. The volume resistivity of strontium titanate particles is 1.0 E+7 [.Math.cm] or more but 1.0 E+10 [.Math.cm] or less.