To provide a nozzle structure capable of preventing the scattering of a liquid to the circumference even in the separation of a nozzle from a surface having a matter to be sucked adhered thereto in the injecting state of the liquid during a sucking work, particularly, a simple nozzle structure having such a characteristic.

This nozzle structure to be connected to a sucking device and used to suck the matter to be sucked comprises a cylindrical nozzle body having an opening for sucking the matter to be sucked on one end side, a liquid injection part provided within the nozzle body part to inject the liquid to be sprayed to the matter to be sucked to the opening side of the nozzle body part, a shielding plate provided within the nozzle body part in such a manner as to be displaceable in the direction orthogonal to the axial direction of the nozzle body part, to which the liquid injected from the liquid injection part is collided, and a driving means connected to the shielding plate to displace the shielding plate by use of the differential pressure with the atmosphere when the nozzle body inner part is laid in a negative pressure. The driving means is operated to displace the shielding plate, whereby the liquid injected from the liquid injection part is prevented from being collided to the shielding plate, and the liquid injected from the liquid injection part is released to the outside through the opening of the nozzle body part.