A cooling unit is provided which cools effectively a plurality of heat sources which are accommodated within small-sized electronic equipment such as a projector. There is provided a cooling unit in which a plurality of base plates 81a, 130a are disposed adjacent closely to each other, each of the base plates 81a, 130a has flat plate-shaped radiating fin 81b, 130b which is erected on rear sides thereof, each of the radiating fin 81b, 130b erected on the base plates 81a, 130a has extending portions 81d, 130d which extends over the rear sides of the base plates 81a, 130a which are adjacent to each other, and one or a plurality of heat sources are heat connected to front sides of the base plates 81a, 130a.