Die for Die Casting, Method of Manufacturing Cast Product, and Cast Product

A method of manufacturing a cast product by die casting, comprising:

• preparing a die including a stationary die, and a movable die to be combined with the stationary die, wherein when the movable die is combined with the stationary die, a biscuit section into which molten metal is to be infused, a product section in which the cast product is to be cast, a runner section which guides the molten metal from the biscuit section toward the product section, and a fin section which is provided between the runner section and the product section, and in which a thickness of the fin section decreases in a direction closer to the product section are formed between the stationary die and the movable die, (i) the fin section is extended from one end part to the other end part of the product section in a direction intersecting a stream direction of the molten metal, and includes a fin central section opposed to the biscuit section in the stream direction of the molten metal , and a fin side section on a side of the fin central section, (ii) the fin side section includes a fin thick part formed thicker than a thickness of the fin central section, the fin thick part is extended to a boundary between the fin section and the product section, and (iii) the product section includes a product thick part connected to the fin thick part in a region opposed to the fin thick part;
• combining the movable die with the stationary die;
• and
• infusing the molten metal into the biscuit section.