An introduction device includes, a grip portion which has a first wall portion, and a second wall portion, a curving portion which is configured to curve in a first surface and in a second surface that intersects at right angles with the first surface, a first dial portion which is rotatably provided in the first wall portion and which curves the curving portion in the first surface in accordance with a rotation amount, and a dial unit includes a shaft rotatably provided on the second wall portion, and a second dial portion which is fixed to the shaft and which curves the curving portion in the second surface in accordance with a rotation amount, the shaft being oblique to the longitudinal axis when seen from the side of the second wall portion.
