An in-mold double-side decorating mold, comprising a first mold (1) in which a vertically movable first decorating film (100) is disposed and a second mold (2) in which a laterally movable second decorating film (110) is disposed and having spool and runner parts (55), (56), and (57). A projected part (52a) protruded more than an area (9a) for passing the second decorating film is formed in at least the portion surrounding the runner parts (55) and (56) of an area directly facing the first decorating film (100) in clamping when both molds (1) and (2) are closed.