An introducing device system includes: an insertion portion; a bending portion which is provided at the insertion portion; an operation portion through which an input operation is performed for bending the bending portion; a pulling member connected to the bending portion and pulled in accordance with the operation through the operation portion; a detection section that detects a moving state of the pulling member; a driving unit that rotationally drives; a driving force transmitting unit including an inner circumferential surface configured to be able to contact an outer circumferential surface of the driving unit, and an outer circumference on which the pulling member is wound, the driving force transmitting unit being reduced in diameter in accordance with pulling of the pulling member; and a driving unit control section controls the driving unit when the moving state detected by the detection section is different from a state determined in advance.