A projection device comprising: an electro-optical element; a drive housing that stores the electro-optical element and includes a central portion and a protruding portion protruding from the central portion; a recessed portion; a projection lens that is disposed in the recessed portion, projects light applied from the electro-optical element onto a projection target, and includes a first rotation mechanism, wherein the projection lens is configured to be rotatable about the first rotation mechanism in a first rotation direction and a second rotation direction, and wherein the projection lens further comprises a second rotation mechanism that is configured to be rotatable in a third rotation direction and a fourth rotation direction; and fans (92, 93) that are disposed in the drive housing and draw in or discharge gas, wherein the recessed portion and the protruding portion are adjacent to each other in a first direction, wherein the first direction comprises a first A direction and a first B direction, wherein the first B direction is directly opposite the first A direction, the projection lens is provided so as to extend to the recessed portion from the drive housing in a second direction crossing the first direction, the central portion includes a first A side surface (55C1) that is provided in the first A direction and a second A side surface (55D1) that is provided in the first B direction, the protruding portion includes a first B side surface (55C2) in the first A direction and includes a second B side surface (55D2), which faces the projection lens, in the first B direction, and the fans face the second A side surface (55D1) and the second B side surface (55D2). an electro-optical element; a drive housing that stores the electro-optical element and includes a central portion and a protruding portion protruding from the central portion; a recessed portion; a projection lens that is disposed in the recessed portion, projects light applied from the electro-optical element onto a projection target, and includes a first rotation mechanism, wherein the projection lens is configured to be rotatable about the first rotation mechanism in a first rotation direction and a second rotation direction, and wherein the projection lens further comprises a second rotation mechanism that is configured to be rotatable in a third rotation direction and a fourth rotation direction; and fans (92, 93) that are disposed in the drive housing and draw in or discharge gas, wherein the recessed portion and the protruding portion are adjacent to each other in a first direction, wherein the first direction comprises a first A direction and a first B direction, wherein the first B direction is directly opposite the first A direction, the projection lens is provided so as to extend to the recessed portion from the drive housing in a second direction crossing the first direction, the central portion includes a first A side surface (55C1) that is provided in the first A direction and a second A side surface (55D1) that is provided in the first B direction, the protruding portion includes a first B side surface (55C2) in the first A direction and includes a second B side surface (55D2), which faces the projection lens, in the first B direction, and the fans face the second A side surface (55D1) and the second B side surface (55D2).