Operating device for rotating rotation body by lever operation and projection apparatus including operating device

An operating device which rotates a cylindrical rotation body by lever operation to adjust a rotation angle, the operating device comprising:

• a lever that is linearly movable along a direction orthogonal to a rotation axis of the rotation body;
• the rotation body that is rotated by lever operation;
• and
• an arm that is fixed to the rotation body and transmits a movement of the lever as a rotational force to the rotation body,
• wherein the arm has a shape extending from the rotation body toward the lever in a state where a position of the lever is at the farthest position within a movable range from a reference line passing through a rotation center of the rotation body and orthogonal to a direction which is orthogonal to the rotation axis of the rotation body, and
• wherein the lever includes:
• an insertion opening which allows the arm to insert to the insertion opening;
• and
• an opening formed on a surface facing in an operating direction such that a tip end side of the arm inserted into an internal space of the lever can enter and exit the opening in accordance with the movement of the lever.