Patent ID: 7465055

Claim:
A rotary operation mechanism for operating an electronic apparatus that is provided with an apparatus main unit and a case that covers said apparatus main unit, said rotary operation mechanism comprising: a rotating member that is rotatably provided in said apparatus main unit; a rotary operator for effecting rotary operation of said rotating member; and an opening that is provided in said case and in which said rotary operator is inserted; wherein said rotary operator is supported by said case in a state of engagement that allows free rotation in said opening; wherein one of said rotary operator and said rotating member is provided with a first engagement part at a position that is separated in a radial direction from a center of rotation, and the other of said rotary operator and said rotating member is provided with a second engagement part having a gap in which said first engagement part is interposed and that makes contact along a line with said first engagement part and engages with said first engagement part, and wherein opposing surfaces of said gap in said second engagement part comprise curved surfaces.