To suppress opening of a slit more securely.

A corrugated tube 10 with a lock includes a main body portion 20 which is provided with mountain portions 22 and valley portions 24 along a peripheral direction alternately and consecutively in an axial direction; a male lock portion 30 which includes an inside lock projection portion 34 projecting to an outer peripheral side, and occupies a range from an end of a slit on one side to one end portion of the main body portion 20; and a female lock portion 40 which includes an outside lock recessed portion 42 formed in a recessed shape to be open to an inner peripheral side and fitted to the inside lock projection portion 34, occupies a range from the end of the slit on the other side in the peripheral direction to the other end portion of the main body portion 20, and is fitted to the male lock portion 30 by being covered over the male lock portion 30. The outside lock recessed portion 42 includes an escape portion 46 having an inner peripheral portion recessed to an outer peripheral side more than an inner peripheral portion of the main body portion 20, and a deep portion 48 which is a part of the outside lock recessed portion 42 except the escape portion 46 has a depth size set larger than the escape portion 46.