The present invention relates to a fixing device combined with an earphone jack. The fixed state of a portable phone or a smart phone with a preset object gripping state is maintained by a first member and a second member to which are mutually hinged by using an elastic support unit. The earphone jack of the portable phone or the smart phone is combined with a combination part in an insertion method by including the hollow combination part which is fixed to either the first member or the second member.
