An image recording apparatus includes a recording head connected to a plurality of laser emitters provided in a line; a linear motor displacing the recording head in a secondary scanning direction; and an apparatus controller controlling the emission of laser light from the recording head and displacement of the recording head by the displacer. In response to rotation of a drum, one cycle of scanning by the recording head in a main scanning direction of a plate is completed. For each drum rotation, the apparatus controller displaces the recording head in the secondary scanning direction by displacement amount smaller than the recording width in the secondary scanning direction according to laser light emitted from the plurality of laser emitters.