A formed body having a curved surface, a method of producing the formed body, a front cover for a vehicle lighting device, and a method of producing the front cover. A front cover (10) for a vehicle lighting device, mounted to a front opening in a vehicle lighting device (16) having a lamp body (12) and a light source (14) which is provided in the lamp body (12), wherein a heat generating body (20) is provided in a substantially rectangular region of that surface of the front cover which faces the light source (14). The heat generating body (20) maintains the relationship of Ra ‰¤ (2 x RO), where RO is the electric resistance value (initial value) of the heat generating body (20) before the heat generating body is elongated and Ra is the electric resistance value of the heat generating body (20) after the heat generating body is elongated 5 %.