Softly a state where crookedness is free and a hardness state where crookedness is regulated use midway, change, the overcoat tube and the like which can the hardness variable flexible device is offered softly.In outer circle 2 of tube 1 of flexibiility, sealing up cover 18 of the flexibiility which the enlarging reduction is done is provided. Sealing up cover becoming 18 and one body, it provides the person in charge stopping section 7 which application/response motion is done, person in charge stopping section 7 provides person in charge stopping possible person in charge stopping hub 11 in outer circle 2 of tube 1. Sealing up cover coming out Iribe 22 of the air is connected to the sealing up space 21 where was formed with 18 and tube 1. Discharging the air from coming out Iribe, 22 when the sealing up space 21 it changes to vacuum from atmospheric pressure, sealing up cover 18 reduction diameter doing axial core 4 as a center, to put in person in charge stopping state in person in charge stopping hub 11 it is possible person in charge stopping section 7. Sealing up cover 18 enlarging diameter doing by the fact that the sealing up space 21 is designated as atmospheric pressure by the fact that the air is supplied to the sealing up space 21 person in charge stopping section cancelling the person in charge stopping state of 7 and person in charge stopping hub, 11 from hardness state can tube 1 change to soft state.屈曲が自由な柔状態と屈曲が規制される剛状態を使用途中であっても切換えすることができる外套管等の柔剛可変可撓装置を提供する。可撓性の管1の外周2に、拡縮する可撓性の密封カバー18を設ける。密封カバー18と一体的となって応動する係止部7を設け、管1の外周2に係止部7が係止可能な係止受け部11を設ける。密封カバー18と管1との間に形成された密封空間21には空気の出入部22を接続する。出入部22から空気を排出して密封空間21を大気圧から負圧に切り換えると、密封カバー18が軸芯4を中心として縮径して係止部7を係止受け部11に係止状態とすることができる。密封空間21に空気を供給することで密封空間21を大気圧とすることで密封カバー18が拡径して係止部7と係止受け部11との係止状態を解除して管1を剛状態から柔軟状態に切換えすることができる。
