An image printing apparatus including a cartridge mounting unit on which an ink cartridge is detachably mountable. The cartridge mounting unit includes a sensor configured to detect a light transmitted through a remaining amount detecting portion. The image printing apparatus further includes a counter configured to count ejected ink and a storage section configured to store a count integrated value. The image printing apparatus further includes a reset section configured to reset the value stored in the storage section. Moreover, the image printing apparatus includes a temporary count holding section configured to temporally store the integrated value stored in the storage section and restore the value of storage section in response to a trigger signal. Therefore, the image printing apparatus may reliably detect an exchange of an ink cartridge and may accurately detect a remaining amount of ink.