The present invention provides an a polyarylene sulfide (PAS) production device provided with a supply tube for loading corrosive materials such as a strong alkali into a reaction vessel, wherein prescribed amounts of various raw materials or the like can be accurately loaded into the reaction vessel without causing decreases in production efficiency due to the replacement of the supply tube or the repair of the reaction vessel in response to the corrosion of the supply tube or the like.The present invention is a production device, and a PAS production device, in particular, provided with a reaction vessel equipped with one or a plurality of supply tubes, at least one of the supply tubes having an insert pipe, which is preferably detachable, to be inserted into an outer supply tube; and a tip opening of the insert pipe being positioned further inward than an inside wall of the reaction vessel.