Provided is a package for an optical device and an optical device module that can reduce or prevent damage occurrence in an optical fiber optically coupled to an optical device while ensuring a good airtightness. A package for an optical device includes a package main unit that accommodates an optical device; a pipe portion that is provided in the package main unit and through which an optical fiber optically coupled to the optical device is inserted; and a fixing portion that is provided in the package main unit and to which one end of the optical fiber is fixed, and the pipe portion includes a first pipe section having a base end fixed to the package main unit and a second pipe section joined to a tip of the first pipe section, having a higher thermal expansion coefficient than the first pipe section, to be sealed by a sealing material.