To provide a flexible tube capable of eliminating influence completely even when transmitting vibration of a vehicle to a spherical face joint part directly, reducing its weight, and improving protection measures and working efficiency for assembling and to provide a manufacturing method for an internal pipe of the flexible tube.

In this flexible tube 10 arranged in an exhaust passage for exhaust gas of an engine and constituted by outer bellows 31b of an external pipe and the bendable internal pipe 4 provided with a plurality of spherical face joint parts F, G, flexible bellows or a bead 4d having smaller diameter than radius of curvature of the spherical face joint parts F, G and swelling in the direction of diameter expansion is provided between the spherical face joint part F of the internal pipe 4 and a pipe end part 4a being a connection part of the internal pipe 4.