To provide a simple joint for a bellow hose with the small number of a constitution member and a low cost assembled to the bellow hose simply at a piping spot.

The simple joint 12 mounted on the end of a bellow hose 10 with a wave shape section is constituted so as to include a cylindrical joint main body 18 on whose axis direction one end side, a male screw 26 is provided and also on the other end side, having an elasticity in the diameter direction and integrally having an elastic claw piece 30, on which inward claws 40 are formed, for obstructing the movement to the axis direction while inserting in the groove 16 of the bellow hose 10 on its end and a lock ring 20 for locking the elastic claw piece 30 into such state that the inward claw 40 is inserted in the groove 16 while slide-inserting to the outer periphery surface of the elastic claw piece 30.