1. A developer container that accommodates developer, comprising:
a first frame that has a recessed portion which has a sloped face; and
a second frame that has a first protruding portion;
wherein the first frame and the second frame are joined by
a first adhering portion in which the sloped face of the recessed portion and the first protruding portion are welded together,
a second adhering portion in which a second protruding portion on one of the first frame and the second frame and a flat portion
on the other side of the first frame and the second frame are welded together,
the recessed portion having a positioning inner side face that performs positioning of the first frame and the second frame.