A long object guiding device includes a long tubular member and is configured to guide a long object inserted through the tubular member while protecting, with the tubular member, the long object in correspondence with displacement of the tubular member. The tubular member has a long sheet shape in an unfolded state. A longitudinal direction of the tubular member intersects a width direction. A first joint portion is disposed on one side edge of the tubular member in the width direction to extend in the longitudinal direction. A second joint portion is disposed on an other side edge of the tubular member in the width direction to extend in the longitudinal direction. At least one end of the tubular member, in the longitudinal direction, has a passage portion that allows for passage of an end of the long object.