Injection molded product and method for manufacturing same

An injection molded product that is injection molded from a molding material including a polymer material and a plurality of thermally expandable capsules mixed therein,

• wherein an unevenness forming portion, which has unevenness formed by the thermally expandable capsules after thermal expansion, is formed to only a portion of a surface of the injection molded product and includes:
• a first unevenness portion comprising a highly expanded portion formed at a surface side of the first unevenness portion in a thickness direction of the injection molded product and in which the thermally expandable capsules are thermally expanded;
• and
• a second unevenness portion comprising an expansion portion formed at a surface side of the second unevenness portion in the thickness direction of the injection molded product and in which the thermally expandable capsules are thermally expanded, the thermal expansion of the thermally expandable capsules in the expansion portion being less than the thermal expansion of the thermally expandable capsules in the highly expanded portion,
• wherein the injection molded product includes:
• a highly expanded portion that is formed at a surface side of the unevenness forming portion in the thickness direction of the injection molded product and in which the thermally expandable capsules are thermally expanded;
• and
• a main body portion that is a portion adjacent to the highly expanded portion in the thickness direction and in which the thermally expandable capsules are substantially not thermally expanded,
• wherein a thickness of the highly expanded portion is a half or smaller than a thickness of the injection molded product in the unevenness forming portion, and
• wherein a polymer material of the highly expanded portion and a polymer material of the main body portion are the same polymer material.