To provide an illuminating device which can be fixed and removed conveniently.

The illuminating apparatus is provided with a light source module and a power source module to be connected with the light source module, and the light source module is provided with a base plate, and at least one solid light emitting element and a plurality of electrodes terminals arranged on the base plate. The above solid light emitting element is electrically connected with the plurality of electrode terminals, and the power source module is provided with an outer shell and a plurality of power source terminals, and in the outer shell, there is formed a light source insertion slot, and the light source module is inserted into the light source insertion slot in a free removal, and, furthermore, the electrode terminals of the light source module and the power source terminals of the power source module are connected.