Patent ID: 7431428

Claim:
An image forming apparatus having: a fixing member which holds nozzle arrays of a plurality of head modules which eject ink at predetermined positions where the nozzle arrays are arranged in a direction crossing a conveying direction of a recording medium, the plurality of head modules constituting one head module group which ejects the ink to the recording medium to be carried, thereby forming an image; an ink path portion which is arranged and coupled to one of an upstream side and a downstream side of the conveying direction of the recording medium with respect to the plurality of head modules, and supplies the ink to the plurality of head modules; a first joint portion which is provided to each of the plurality of head modules and functions as an ink receiving opening; and a second joint portion which is a part of the ink path portion and detachably engaged with the first joint portion to function as an ink supply opening, wherein, when the plurality of head modules move in a first direction crossing a recording surface of the recording medium to be held at the predetermined positions of the fixing member, the first joint portion is fitted in and engaged with the second joint portion in the first direction.