An introduction device includes an operation section including a first surface and a second surface a bending section capable of bending in a first direction and a second direction crossing the first direction a first rotary body configured to be operated at a time of bending the bending section in the first direction and a second rotary body configured to be rotatable about a second shaft portion extending in a direction along the first shaft portion at a position which is closer to the thumb than the first shaft portion, to be provided on the second surface side within an operation range of the thumb, and to be operated at a time of bending the bending section in the second direction.
