In regard to an ear mold for a hearing aid, there are provided the ear mold which a metal bush is settled in a tube for joint of the hearing aid, the metal bush has been used on account of settlement of said tube for joint of the hearing aid, and which a tube is adhered by an adhesive, the adhesive has been used on account of settlement of said tube. However, said ear mold has disadvantages that said tube is easily moved for the reason of instability, said tube drops out from the ear mold, and the ear mold has the problem of a phenomenon of a howling by sound leak-out.An ear mold E based on custom-made impression 1 and joined the ear hook hearing aid, also, in said ear mold E, a hub 12 having an elbow-loading-hole 121, a sound-leading tube loading hole 122 and an introductory-hole of a ear mold forming material 123 were embedded into an ear mold 17, a sound-leading tube 14 was loaded the sound-leading tube loading hole 122 of the hub 12, an elbow 13 was joined (loaded) with said elbow-loading hole 121 of the hub 12, the elbow 13 was loaded a tone tube 21, the hub 12 was fixed the body portion of the ear mold forming material 17 through the introductory-hole of the ear mold forming material 123, and a method of preparing of thereof.