A protective device for an elongated hollow body, in particular a cylindrical tube, the protective device being provided for being nondestructively, detachably fastened to an end section of the hollow body, wherein the protective device comprises - a first half-shell and a second half-shell, each having an inner contour (13, 23) which together are adapted to an outer shape of the end section of the hollow body, the end section extending in particular in the axial direction of the hollow body, and which, when the first and the second half-shell are placed laterally on the end section, abut one another in flush alignment and thereby circumferentially enclose the end section of the hollow body, the first and the second half-shell (10, 20) having a respective first end (11, 21) and a second end (12, 22) and being provided for abutting against a free end of the hollow body with their respective first end (11, 21); - a cap having a recess with an inner contour, the cap being movable across the first and the second half-shell (10, 20) in the axial direction of the end section of the hollow body when the first and the second half-shell (10, 20) enclose the section of the hollow body, characterized in that - the first and the second half-shell (10, 20), when they are placed laterally on the end section of the hollow body and abut one another in flush alignment, in particular in the axial direction, and thereby circumferentially enclose the end section of the hollow body, have a conical outer contour, an outer diameter at the first ends (11, 21) of the assembled half-shells (10, 20) being smaller than an outer diameter at the second ends of the half-shells (10, 20), and - the cap is a clamping cap having a conical inner contour. - a first half-shell and a second half-shell, each having an inner contour (13, 23) which together are adapted to an outer shape of the end section of the hollow body, the end section extending in particular in the axial direction of the hollow body, and which, when the first and the second half-shell are placed laterally on the end section, abut one another in flush alignment and thereby circumferentially enclose the end section of the hollow body, the first and the second half-shell (10, 20) having a respective first end (11, 21) and a second end (12, 22) and being provided for abutting against a free end of the hollow body with their respective first end (11, 21); - a cap having a recess with an inner contour, the cap being movable across the first and the second half-shell (10, 20) in the axial direction of the end section of the hollow body when the first and the second half-shell (10, 20) enclose the section of the hollow body, - the first and the second half-shell (10, 20), when they are placed laterally on the end section of the hollow body and abut one another in flush alignment, in particular in the axial direction, and thereby circumferentially enclose the end section of the hollow body, have a conical outer contour, an outer diameter at the first ends (11, 21) of the assembled half-shells (10, 20) being smaller than an outer diameter at the second ends of the half-shells (10, 20), and - the cap is a clamping cap having a conical inner contour.