This invention provides a plastic container characterized in that an expanded layer comprising expanded cells having a flat shape with an average major axis of not more than 400 m and an average aspect ratio (L/t) of not less than 6 as viewed in cross section of the container wall along the maximum stretch direction, which are oriented in the stretch direction and are distributed so as to be superimposed on top of each other in the thickness-wise direction, is formed within the container wall. In this container, expanded cells having a flat shape are distributed so as to orient in a given direction and, thus, has light shielding properties and has a pearl-like appearance, that is, has a very high commercial value. Further, since any colorant is not contained, the suitability for recycling is excellent.

The present invention relates to a mold for a multi-layer container. The mold includes a cold-half portion containing a cavity, and a hot-half portion containing a first resin flow path for connecting an interior of a first injection cylinder to the cavity, a second resin flow path for connecting an interior of a second injection cylinder to the cavity, and a junction portion of the first resin flow path and the second resin flow path. The junction portion in the hot-half portion is positioned upstream of a gate portion opened to the cavity included in the cold-half portion, the second resin flow path contains an inhibitor for partially inhibiting a resin flow.

Provided is a blow-molded container exhibiting inhibited coloring, odor, and generation of defects such as gelation and streaks which are caused on melt molding, and having a superior appearance. Also provided is a blow-molded container that has a favorable self-purge feature in production and satisfactory qualities such as strength, and can be produced at low cost. The blow-molded container includes a first layer containing an ethylene-vinyl alcohol copolymer (I), wherein the first layer contains a saturated carbonyl compound (II) having 3 to 8 carbon atoms, the saturated carbonyl compound (II) is a saturated aldehyde (II-1), a saturated ketone (II-2) or a combination thereof, and the content of the saturated carbonyl compound (II) in the first layer is 0.01 ppm or greater and 100 ppm or less.