A female mold (20) of an in-mold injection molding mold device (1) has a first suction hole (31), a second suction hole (32), and a concave suction groove (33). The first suction hole (31) opens in a bottom surface (22) of a cavity (21) of the female mold (20). The second suction hole (32) opens in a part, to the inside of a clamper (40), of a clamping surface (25) of the female mold (20) on which a male mold (10) abuts, with a decoration film (100) held therebetween. The suction groove (33) is formed on a front surface of the female mold (20) so as to make the cavity (21) and the second suction hole (32) communicate with each other. The first suction hole (31), the second suction hole (32), and the suction groove (33) function as exhaust paths when air in a space (SA) between cavity surfaces (22, 23, and 24) defining the cavity (21) and the decoration film (100) is being discharged.
