This image generating apparatus comprises a chassis including a first mounting portion and a second mounting portion and a print head including a first arm and a second arm rotatably mounted on the first mounting portion and said second mounting portion respectively. The first arm and the second arm of the print head are provided with a first stop portion and a second stop portion regulating movement of the print head in the direction of a rotation axis respectively, while a first angular range in which the first arm is mountable on/dismountable from the first mounting portion is different from a second angular range in which the second arm is mountable on/dismountable from the second mounting portion.