An injection mold including a gate and a cavity, where a weld portion is formed inside the cavity by injecting molten resin containing reinforcing fibers from the gate into the cavity, the injection mold has a resin reservoir open to the cavity, and in a first cross section along an opening end surface 110S of the resin reservoir 110 to the cavity, a distance CLD between a width center line CL11 of the resin reservoir and a width center line of the cavity, which is measured along a perpendicular line n12 of the width center line CL12 of the cavity, changes at least in part along the width center line of the cavity.