Nozzle device and nozzle member

The present inventioin provides a nozzle device with a nozzle member thereof being replaceable with respect to plural headers without welding, and the weight thereof can be reduced. The nozzle device comprises of plural headers (1), (2), which are long and cylindrical, for supplying plural fluids respectively, a fitting port formed at substantially equal interval in the longitudinal direction of headers and penetrating in the direction perpendicular to the longitudinal direction of the headers, a nozzle body (5) replaceably fitted to the fitting port and having flow paths (or connection holes) (9)-(12) in connection with the headers, a nozzle tip (4) fixed to the nozzle body, seal members (13)-(15) respectively placed onto the joint portions (flat portions) of headers (1), (2) and nozzle body (5), and a conjoining means (16) thread-engageable to the thread portion (8) of the end of nozzle body (5). Within the nozzle body, a space for mixing the fluids coming from each of the headers may be provided.