Locking mechanism for tubular body

A locking mechanism for a tubular body with an engagement portion, comprising:

• a tubular housing having a slit, and configured to mount the tubular body on at least one end of the tubular housing, and
• a locking member that locks and releases the housing and the tubular body,
• wherein the locking member is mounted on the housing to be able to move in an outer diameter direction by a tapered portion of the tubular body when the tubular body is inserted, and includes a leading end portion bent in an axial direction of the housing, and a curved portion bent in an inner diameter direction disposed at a leading-end side of the locking member and passing the slit to lock with the engagement portion of the tubular body inserted into the housing;
• and
• the housing includes a guide unit for widening the curved portion toward an outside when the locking member is moved to the outer diameter direction, the guide unit protruding outwardly perpendicular to the axial direction from an outer surface of the housing to extend along the outer surface and having two bumps spaced apart from each other along the outer surface with a holding portion therebetween and an oblique sliding surface that extends from the holding portion downwardly along the outer surface of the housing so that when the leading end portion of the locking member engages the holding portion, the curved portion does not project inwardly from the tubular housing through the slit, and when the leading end portion comes out from the holding portion, the leading end portion slides downwardly along the oblique sliding surface to allow the curved portion project inwardly from the slit.