A flexible tube 25 for an endoscope 10 includes a helical tube 100, a cover 400, and an inhibition mechanism 500. The inhibition mechanism 500 enables movement of a densely wound portion 103 to the cover 400 in a direction of a central axis of the helical tube 100 and inhibits movement of a loosely wound portion 101 to the cover 400 in the central axis direction of the helical tube 100.