Formed body having a layer of thermoplastic resin

An injection-formed body having a layer of a resin composition constituted by a polyolefin resin and a barrier resin, wherein:

• the barrier resin is an ethylene-vinyl alcohol copolymer;
• the layer of said resin composition forms, in a matrix of the polyolefin resin, a layer structure in which the barrier resin is dispersed in the form of a lamellar dispersion phase stretching in one direction;
• an aspect ratio (a) of the dispersion phase of the barrier resin in a surface portion near the surfaces of the layer is 2.5 to 4.0, an aspect ratio (b) of the dispersion phase of the barrier resin in the central portion in the direction of thickness of the layer is 1.6 to 3.0, a ratio (a)/(b) of the aspect ratio (a) and the aspect ratio (b) is 1.1 to not more than 2.0, the central portion in the direction of thickness of the layer stands for a range of 40 to 60% of the whole thickness of the layer that is regarded to be 100%, and the surface portion stands for the portions excluding the central portion;
• the melt flow rate (MFRm) of said polyolefin resin is 0.1 to 1.8 g/10 min., while the melt flow rate (MFRb) of said barrier resin is 84.8 to 93.6 g/10 min., and the ratio (MFRb/MFRm) of the melt flow rate (MFRb) of said barrier resin and the melt flow rate (MFRm) of said polyolefin resin is 11 to 200.