The present invention provides a nozzle device (100) for supplying a chemical (Y) with respect to a travelling body (50) in a paper machine (101), the nozzle device (100) being provided with a nozzle main body part (2) having a chemical nozzle aperture (1) able to discharge the chemical (Y) and an air main body part (10) able to deliver air from both sides of the nozzle main body part (2) so as to hold the discharged chemical (Y) therebetween. The air main body part (10) has an air-introduction flow path (13) through which air is introduced, a front-rear pair of distribution flow paths (14) for communicating with the air-introduction flow path (13), and a pair of air nozzle apertures (12) which discharge air and communicate respectively with the distribution flow paths (14). The nozzle device (100) is such that the relation of the surface area (SA) of the air-introduction flow path (13) and the surface area (SB) of the air nozzle aperture (12) is SA >= SB, and air can be efficiently delivered and a chemical can be supplied to a travelling body at a high adhesion rate.