To increase luminous energy when using upper surface light emission type organic EL for an exposure device.

In this exposure device exposing a flux of light emitted from a light emitting device substrate wherein an array of light emitting devices are formed on the same base material and the light emitting devices on an image carrier by at least one image formation means, the light emitting device substrate has an organic electroluminescent device comprising a base material, a positive electrode, an organic layer, and a negative electrode transparent to a light wave length of the light emitting device as a light emitting device. The exposure device is a microlens array wherein at least one of the image formation means is integrated with the light emitting device substrate on the image carrier side rather than the negative electrode side.