A two-dimensional image formation apparatus according to the present invention is provided with laser sources (1a).about.(1c), diffusers (6a).about.(6c) for diffusing light, illumination optical systems for irradiating the diffusers (6a).about.(6c) with lights emitted from the laser sources (1a).about.(1c), diffuser vibration units (13a).about.(13c) for vibrating the diffusers (6a).about.(6c), and spatial light modulators (7a).about.(7c) disposed near the diffusers (6a).about.(6c), for modulating the lights emitted from the laser sources (1a).about.(1c) and diffused by the diffusers (6a).about.(6c), wherein the diffusers (6a).about.(6c) are vibrated by the diffuser vibration units (13a).about.(13c) at a velocity that satisfies a relationship, V>d.times.30 (millimeters/sec), which is established between the grain size d of the diffusers and the vibration speed V of the diffusers, whereby speckle noise existing in an image projected on a screen (11) can be effectively reduced.