The biological introduction apparatus (10) includes a drive force generation and input mechanism (30) which generates drive force and inputs drive force, a drive force transmission mechanism (40) which arranged on an outer side than the insertion unit (101) in a radial direction of the insertion unit (101), the drive force transmission mechanism (40) transmits the drive force input by the drive force generation and input mechanism (30), a helical rotation member (50) which has flexibility, and rotates in a periaxial direction of a longitudinal axis by the drive force transmitted by the drive force transmission mechanism (40) and a holding member (60) which is arranged on the proximal end portion side than the fin portion (53) and holds a main body portion (51) rotates in the periaxial direction of the longitudinal axis by the drive force. The biological introduction apparatus (10) further includes a positioning mechanism (70 ) which positions the helical rotation member (50) to the insertion unit (10).
