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 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 (X), wherein the first direction (X) comprises a first A direction (X2) and a first B direction (X1), wherein the first B direction (X1) is directly opposite the first A direction (X2), the projection lens is provided so as to extend to the recessed portion from the drive housing in a second direction (Y) crossing the first direction (X), the central portion includes a first A side surface (55C1) that is provided in the first A direction (X2) and a second A side surface (55D1) that is provided in the first B direction (X1), the protruding portion includes a first B side surface (55C2) in the first A direction (X2) and includes a second B side surface (55D2), which faces the projection lens , in the first B direction (X1), 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 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 (X), wherein the first direction (X) comprises a first A direction (X2) and a first B direction (X1), wherein the first B direction (X1) is directly opposite the first A direction (X2), the projection lens is provided so as to extend to the recessed portion from the drive housing in a second direction (Y) crossing the first direction (X), the central portion includes a first A side surface (55C1) that is provided in the first A direction (X2) and a second A side surface (55D1) that is provided in the first B direction (X1), the protruding portion includes a first B side surface (55C2) in the first A direction (X2) and includes a second B side surface (55D2), which faces the projection lens , in the first B direction (X1), and the fans face the second A side surface (55D1) and the second B side surface (55D2). <EOS>