Disclosed are a cooling unit including a blowing device and a heat sink, and an illuminating apparatus including the cooling unit, in which the assembling workability is improved. The blowing device has a frame configured to rotatably support a blower. The heat sink has an accommodating portion. The blowing device is displaceable between a first position at which the blower is disposed outside the accommodating portion, and a second position at which the blower is accommodated in the accommodating portion by the frame pivotably supported outside the accommodating portion.