To provide a jack structure which has a high strength against prying in the case a plug is inserted aslant, and is effective in attaining thinness.

This is the jack structure for connecting the plug having an outer peripheral electrode and a center electrode in its center part, and is provided with an installation hole provided in a resin-made housing, a cylindrical contact part of nearly circular cylindrical shape arranged along the inner circumference face of the installation hole, and a sleeve spring portion for electrically connecting to the outer peripheral electrode of the plug. A pin terminal which is electrically connected to the center electrode of the plug is provided in the depth part of the installation hole, and the cylindrical contact part has a first elastic member which is cut and erected inside from the sidewall and a sidewall aperture part in which a part of the sidewall is cut out, and the sleeve spring portion has a second elastic member which projects inside from the sidewall aperture part of the cylindrical contact part.