DOUBLE CONTAINER, METHOD FOR ATTACHING REFILL IN DOUBLE CONTAINER, AND CONNECTING PARTS

Invention's double container 100 includes: inner container 1 including mouth and shoulder parts; outer container 2 having side wall and accommodating inner container 1 replaceably; two-stage tube-shaped first connecting member 4 having opening through which inner container 1's mouth part can be inserted, and threadedly engageable with outer surface of outer container's side wall while covering inner container's shoulder part and side wall's upper end; and approximately tube-shaped second connecting member 5 having opening through which inner container's mouth part can be inserted and situated inside first connecting member. Second connecting member 5 includes: inner-circumference rotation restricting part 57 contacting part of inner container 1's mouth part 14 to restrict rotation relative to mouth part; and outer-circumference rotation restricting part 52 contacting part of outer container 2's side wall to restrict rotation relative to outer container 2. When assembled, inner container is restricted from rotation relative to outer container 2.