PURPOSE:To obtain the sucker, which can cope with the difference of the form and size of an objective part extending over a wide range, by setting up coaxial inner and outer nozzles sharing a vacuum sucking path and forming the inner nozzle to a slidable shape. CONSTITUTION:When sucking the small part 2a, a chamber 11a is pressurized P1 to push a plug 6 down, a hollow conduit 5, a nozzle chip 3a, a negative pressure introducing pipe 7 and a collar 8 are also pushed down, and the collar 8 is brought into contact with the stepped section of the outer nozzle 4 to bring the nozzle to a sucking-able state. P1 Functions as an air spring to prevent the damage of the part 2a. Negative pressure P2 is applied to evacuate the insides of the nozzle chip 3a and the pipes 5 and 7, and the part 2a is sucked to the nose of the nozzle. When sucking a large part 2b, the chamber 11a is evacuated and sucked, the plug 6, the pipe 5, the nozzle chip 3a, the pipe 7 and the collar 8 are pulled up integrally, the collar 8 is brought into contact with a spring seat 9, the inner nozzle 3 is encased in the outer nozzle 4, and the part 2b is sucked by the outer nozzle 4. Damage on the contact of the nozzle 4 and the part 2b is prevented by buffer action by the spring seat 9 and a spring 10.
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