PURPOSE: To attach a handle of polyester to the bottle properly and securely and prevent the bottle from becoming extremely thin at the wall or from rupturing during the forming process by crystallizing the fastening part of the handle at least at the part corresponding to the part of the handle at which it is put in contact with the bottle.

CONSTITUTION: The bottle relates to a bottle of polyester provided with a separately formed handle 3 of polyester at a recession 2 in the bottle body 1 formed for attaching the handle. Fastening parts 4 of the handle 3 at least at the parts corresponding to the parts of the handle at which it is put in contact with the bottle are crystallized at a crystallinity of 10% or more. In attaching the handle 3 to the bottle body 1 by blowing molding, by preliminarily crystallizing the fastening parts 4 of the handle 3, which undergo fusion attachment, the fastening parts 4 are rendered difficult of softening. Hence fusion attachment of the fastening parts to the wall of the bottle does not easily occur; it does not occur for the wall to be overstretched to extreme thinness; and the bottle is prevented from rupturing during the forming. Moreover, the fastening parts 4 are little liable to deformation or dislocation so that the handle can be attached properly and securely.