Injection molded article

An injection molded article that is obtained by injection molding a molten resin into a mold, the injection molded article comprising:

• a base, the base being a thin plate-shaped member that is connected to a gate of the mold;
• and
• a plurality of protrusions each integrally molded on the base and having a thickness greater than a plate thickness of the base;
• wherein the plurality of protrusions have holes each extending through the base;
• wherein a projected region of the base is processed to have a surface roughness greater than a surface roughness of a mirror surface region surrounding the holes on the base, and the projected region is where a region of the protrusions having a thickness value of 95 to 100% is projected on the base when a thickness value of a thickest portion of the protrusions is defined as 100%;
• and
• wherein the injection molded article is obtained from the mold processed such that the mirror surface region and the projected region are located close to each other.