A projection apparatus comprising: a main body section that has an electro-optical element and that causes the electro-optical element to emit a projection image; a projection lens that projects the projection image emitted from the electro-optical element, the projection lens comprising a second optical system and a third optical system, the second optical system being provided rotatably around a first rotation axis with respect to the main body section, the third optical system being rotatable around a second rotation axis extending in a direction intersecting with the first rotation axis; a posture information acquisition unit that acquires posture information indicating a posture of the projection lens with respect to the main body section, the posture information changing in accordance with a rotation state of the first rotation axis and a rotation state of the second rotation axis; a shift unit that causes the electro-optical element and the projection lens to relatively move in a plane intersecting with an axial direction of the first rotation axis; a first detection unit that detects a rotation state of the second optical system when the second optical system has been rotated around the first rotation axis; a second detection unit that detects a rotation state of the third optical system when the third optical system has been rotated around the second rotation axis; and a control unit configured to control the shift unit based on the posture information acquired by the posture information acquisition unit and using detection results detected by the first detection unit and the second detection unit to shift a projection image in a direction reducing interference between the projection image and the main body section; characterized in that: the control unit is configured to control the shift unit based on the posture information to cause a shift amount of the projection image to be larger when a projection direction of the projection lens is on a side on which the main body section is located than a shift amount of the projection image when the projection direction of the projection lens is on a side opposite to the side on which the main body section is located a main body section that has an electro-optical element and that causes the electro-optical element to emit a projection image; a projection lens that projects the projection image emitted from the electro-optical element, the projection lens comprising a second optical system and a third optical system, the second optical system being provided rotatably around a first rotation axis with respect to the main body section, the third optical system being rotatable around a second rotation axis extending in a direction intersecting with the first rotation axis; a posture information acquisition unit that acquires posture information indicating a posture of the projection lens with respect to the main body section, the posture information changing in accordance with a rotation state of the first rotation axis and a rotation state of the second rotation axis; a shift unit that causes the electro-optical element and the projection lens to relatively move in a plane intersecting with an axial direction of the first rotation axis; a first detection unit that detects a rotation state of the second optical system when the second optical system has been rotated around the first rotation axis; a second detection unit that detects a rotation state of the third optical system when the third optical system has been rotated around the second rotation axis; and a control unit configured to control the shift unit based on the posture information acquired by the posture information acquisition unit and using detection results detected by the first detection unit and the second detection unit to shift a projection image in a direction reducing interference between the projection image and the main body section; characterized in that: the control unit is configured to control the shift unit based on the posture information to cause a shift amount of the projection image to be larger when a projection direction of the projection lens is on a side on which the main body section is located than a shift amount of the projection image when the projection direction of the projection lens is on a side opposite to the side on which the main body section is located