To provide an inspection device of a gastric fistula catheter, which does not require sterilization treatment and relieves the pain of a patient without directly touching an affected part in a body of the patient.

An inspection device 100 of a gastric fistula catheter includes: an observation container 10 inserted into a tube 3 of the gastric fistula catheter 1, whose bottom 11 is composed of a sealed transparent cylindrical body; a fiberscope 20 inserted into the observation container 1, which has an objective lens 21 on its tip part; and an image processing device 30 connected to the fiberscope 20, which processes information collected from the fiberscope 20 to display an image.