Provided, without reducing operability, is a medical tubular body conveyance device that is unlikely to develop a kink. This medical tubular body conveyance device has an outer tube in which a medical tubular body is disposed in an inner cavity thereof, an interpolation member that is disposed in the inner cavity of the outer tube, and a guide wire insertion member on a proximal side relative to the medical tubular body, wherein the guide wire insertion member has formed therein a through path for allowing a guide wire to be inserted in the inner cavity, a part of the interpolation member is fixed to the guide wire insertion member, and the cross-section area of a cross section perpendicular to the axial direction of the guide wire insertion member satisfies formula (1). A cross-section area Sa represents the cross-section area of the guide wire insertion member at a center position, in the axial direction, between the most distal position of the guide wire insertion member and the most proximal position of a fixing area in which the guide wire insertion member and the interpolation member are fixed. A cross-section area Sb represents the cross-section area of the guide wire insertion member at the most proximal position of the fixing area of the guide wire insertion member. Formula (1): cross-section area Sa>；cross-section area Sb.La présente invention concerne, sans réduire l'efficacité fonctionnelle, un dispositif de transport de corps tubulaire médical qui n'est pas susceptible de développer un pli. Ce dispositif de transport de corps tubulaire médical présente un tube externe dans lequel un corps tubulaire médical est disposé dans sa cavité interne, un élément d'interpolation qui est disposé dans la cavité interne du tube externe, et un élément d'insertion de fil-guide sur un côté proximal par rapport au corps tubulaire médical, où l'élément d'insertion de fil-guide présente formé à l'intérieur un passage traversant pour permettre à un fil-guide d'être inséré
