A light source device includes a light source unit (2) which emits primary light, an illumination unit (3) which optically converts the primary light to secondary light and then emits the secondary light, a connector (4) which allows the light source unit (2) and the illumination unit (3) to be attached to and detached from each other, and an electric connection electric port (4a4, 4b4) which transmits illumination unit information to the light source unit, the illumination unit information being information regarding the illumination unit.
