An image forming system includes: a rotatable image carrier; a charger that is disposed to be opposed to the image carrier, and configured to charge a surface of the image carrier; a light exposer that is disposed to be opposed to the image carrier downstream of the charger in a rotational direction of the image carrier, and configured to expose the image carrier by transmitting light through multiple lenses arranged in an axial direction of the image carrier to form a latent image on the image carrier, the light being emitted from multiple light emitting elements; and a first ventilation pipe that is provided between the charger and the light exposer to construct part of an in-pipe wall surface at a lateral surface of the light exposer, and configured to allow air to pass through the first ventilation pipe, the lateral surface closer to the charger.