To provide a pipe conveyor device for effectively preventing the splash and leakage of carried objects while utilizing existing facilities by forming a terminal in the cross direction of a belt to hold the belt in an air sealed condition when rolling the belt into a pipe shape.

Both side edge portions 5x, 5y in the cross direction of the belt 5 are superimposed with each other at the position of a shape retaining roller 7a positioned at the uppermost portion to form a superimposed portion 9. In the embodiment of the present invention, a magnetic material 10 is embedded in the side edge portion 5y in the inner side of the belt 5 along the longitudinal direction of the belt 5, and magnetic force generating means 11 is provided on the shape retaining roller 7a supported by a supporting plate 7 supporting the superimposed portion 9 formed by the both side edge portions 5x, 5y of the belt 5 for attracting the magnetic material 10 embedded in the side edge portion 5y in the inner side of the superimposed portion 9 and holding the belt 5 in the air sealed condition.