Led light source apparatus

A together with a control unit for controlling the LED and LED hardly giving thermal influence each other thermally separated and both allowable temperature fin shape corresponding to the optimal ones, respectively. The A LED substrate 21 and the first housing 22 which houses a substantially closed space, and the second housing 24 which houses a substantially closed space control unit 23 for controlling the LED 211, a connecting member 25 for connecting substantially thermally isolate the first housing 22 and second housing 24, provided between the facing surfaces facing each other of the first housing 22 and second housing 24 fan a mechanism 26, in the opposing surface 22a of the first housing 22, and the heat radiation fins 27 provided around the fan mechanism 26, opposite the air intake side 26a of the fan mechanism 26 in the opposing surface 24a of the second housing 24 one end opening 28a is formed at a position, and an air passage 28 to which the other end opening 28b on different surfaces are formed to the opposing surface 24a of the second housing 24. .The