Abstract: A foul fluid splashing prevention device for an endoscope, which prevents foul fluids inside the body cavity from splashing, even when they spray out from a manipulating portion side of the endoscope. The foul fluid splashing prevention device includes a foul fluid absorbing member made of flexible water-absorbing material for absorbing the foul fluids that leak out of an external opening of the endoscope. The splashing prevention device further includes a retaining member, which is detachably disposed at the manipulating part to retain the foul fluid absorbing member when the foul fluid absorbing member covers the external opening.