A projection display apparatus comprising: a housing member that accommodates an illumination optical unit; a projection optical unit; and a cooling unit, wherein the housing member includes a layout space in a virtually columnar shape having a bottom that is a circumscribed circle of the projection optical unit in a cross sectional view vertical to the projection optical unit; the layout space includes a first layout space in a substantially conical shape and a second layout space excluding the first layout space; the projection optical unit is provided in the first layout space; and at least a part of the illumination optical unit and the cooling unit is provided in the second layout space; and the illumination optical unit and the cooling unit are disposed in a symmetrical positional relationship with respect to the projection optical unit.