A camera system for monitoring the inside of a body having excellent work efficiency is suggested. The camera system for monitoring the inside of a body includes: a cable (12) in which one end is connected to the imaging part； a first auxiliary tool (8) which is connected to the other end of the cable (12)； and a second auxiliary tool (7) which includes a holding unit (7g) which holds a held unit (8g) provided in the first auxiliary tool (8), and a rod-like unit (7x) connected to the holding unit (7g), and which draws out the held unit (8g) toward the outside of the body from the inside of the body through the inside of a tube-like device (6) of which one end is guided toward the inside of the body, in a state of being held by the holding unit (7g).
