An image forming apparatus includes a recording head, a liquid cartridge, a cartridge holder, a hook member, and an engagement portion. The recording head ejects liquid droplets. The liquid cartridge stores liquid to be supplied to the recording head. The cartridge holder replaceably mounts the liquid cartridge. The hook member is integrally formed with an inner wall face of the cartridge holder to engage the liquid cartridge when the liquid cartridge is mounted in the cartridge holder. The engagement portion is provided at an outer wall face of the liquid cartridge to engage the hook member.