Led illumination device

An LED illumination device comprising:

• an LED substrate on which an LED package is mounted;
• a base having a concave part for housing the LED substrate;
• a heat sink;
• a cooling fan;
• and
• a casing housing the LED substrate, the base, the heat sink, and the cooling fan, wherein
• the heat sink is constituted of a rectangular flat plate which is thermally connected to a surface of the base opposite to the surface in which the concave part is formed and a plurality of rib-shaped first heat radiation fins which are disposed on a heat radiation surface of the flat plate opposite to the surface thereof thermally connected to the base such that both ends of each thereof protrude outward from a pair of opposing sides of the flat plate,
• the base is formed into a shape from which the part of each first heat radiation fin that protrudes from the flat plate is exposed in a state where the first heat radiation fins are disposed on the heat radiation surface, and
• the cooling fan takes in air from outside of the casing in a substantially perpendicular direction with respect to the heat radiation surface and forms an air passage along which the taken-in air passes through the both ends of each first heat radiation fin and goes out of the casing.