Provided is a multilayer moulded body used as a piping member, a container, a tube or the like which is used to convey liquid organic substances such as fuels, and which is capable of suppressing the amount of gas generated as a result of heating, said multilayer moulded body exhibiting adhesive properties superior to those of other resin components, without compromising the excellent intrinsic barrier properties of polyarylene sulfide resin with respect to the liquid organic substances. More specifically, the present invention relates to a multilayer moulded body having a multilayer structure obtained by co-extrusion moulding: a polyarylene sulfide resin composition having, as essential components thereof, a polyarylene sulfide resin, an aromatic epoxy resin, and a thermoplastic elastomer; and a thermoplastic resin having a specific functional group. The multilayer moulded body can be obtained using a method in which the polyarylene sulfide resin undergoes a reaction in a molten mixture including a diiodo aromatic compound, elemental sulfur, and a polymerization inhibitor.