To provide an exposing device in which dislocation of an optical device by unreasonable work is eliminated and maintenance effect can be improved.

The device is provided with one or more shades and reflection plates for guiding picture light from an original to a second optical device. The first reflection plate and the second reflection plate for guiding picture light from a first optical device into a device body are arranged in the second optical device. Picture light outside the device body is guided into the device body. The exposing device is provided with a wire which is wound to a rotation support arranged at the device body for driving the optical device and whose both ends are fixedly connected to arbitrary places in the device body. The first and second optical devices are connected to the wire and can move in connection with rotation of the rotation support. The first and second optical devices are divided into a main body-side connector and the optical device so that they can freely be removed from the wire.