Method for manufacturing resin container and apparatus for manufacturing same

A manufacturing method of a resin container, the manufacturing method comprising:

• injection-molding a first layer of a preform having a convex portion extending in an axial direction on an inner peripheral surface or an outer peripheral surface as a first injection molding, the preform being formed in a bottomed cylindrical shape, using a first resin material having a light-transmitting property;
• injecting a colored second resin material on a surface side on which the convex portion of the first layer is formed and laminating a colored second layer in a region excluding the convex portion of the first layer while exposing the convex portion in the axial direction as a second injection molding;
• arranging a heating member extending in the axial direction within the preform obtained in the second injection molding to adjust a temperature of a preform as a temperature adjustment;
• and
• blow-molding the preform after the temperature adjustment a state of having residual heat from injection molding to manufacture the resin container,
• wherein the resin container has a light-transmitting region extending in the axial direction by shaping the convex portion and a non-light-transmitting region by shaping the second layer, and
• in the temperature adjustment, a first distance between the heating member and the convex portion in the radial direction of preform is set to be shorter than a second distance between the heating member and portions other than the convex portion, and at least a position of the convex portion in the circumferential direction of the preform is locally heated.