Provided is a flexible tube, for an endoscope, having a flexible tube substrate, for an endoscope, that is flexible and tubular and a resin layer covering the flexible tube substrate for an endoscope. The resin layer includes one or more layers, the layers including a layer A including a polyester elastomer (a) as a resin component, a hindered amine compound (b), and a particular compound (c). Also provided are an endoscopic medical device including the flexible tube for an endoscope and a resin composition and a set of resin compositions that are suitable for forming the resin layer of the flexible tube for an endoscope.