An inkjet image forming apparatus includes an ink container and a container installed part. The ink container stores an ink. To the container installed part, the ink container is attached/detached. The ink container includes an RFID tag, a pouch pack and a container case. The pouch pack contains the ink. The container case covers the pouch pack, has one wall to which the RFID tag is fixed and further has an engaging part stopping the pouch pack in an engaged state and keeping a distance between the RFID tag and the pouch pack a predetermined value or more. The container installed part includes an RFID sensing circuit board configured to carry out wireless communication with the RFID tag.