Abstract: A work processing system S is provided with a plasma generating unit PU including a microwave generator 20 for generating microwaves of 2.45 GHz, a waveguide 10 for causing the microwaves to travel and a plasma generator 30 mounted on a surface of the waveguide 13 facing a work W; and a work conveyor C for conveying the work W to pass the plasma generator 30. The plasma generator 30 includes a plurality of arrayed plasma generating nozzles 31 for receiving the microwaves, generating a plasma-converted gas based on a receiving electrical energy and discharging the generated gas. The plasma-converted gas is blown to the work W in the plasma generator 30 while the work W is conveyed by the work conveyor C. It is possible both to successively plasma-process a plurality of works and to efficiently plasma-process works having large areas.