A method for manufacturing a glow plug housing, the glow plug housing, and a glow plug reduce a manufacturing cost by using a forging process instead of a cutting process. An insertion part is forged and formed from an outer circumference in a side with which a head part is couple(S63). A hollow body includes a sawtooth part in the outer circumference of the insertion part. The head part including a sawtooth groove corresponding to the sawtooth part of the body in an inner circumference is separately formed(S65). The head part and the body are coupled by inserting the sawtooth part into the sawtooth groove(S71). One end of the insertion part is bent and compressively fixed at a compressive plane of the head part(S72).
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