A connection structural body (1, 1a, 1b), comprising: an aluminum electric wire tip part (202a, 205a) and a crimp terminal which are connected to each other; wherein: the aluminum electric wire tip part (202a, 205a) is an exposed tip part of an insulated wire including an aluminum electric wire (202, 205) and an insulating cover for covering the aluminum electric wire (202, 205), and is exposed as a result of being stripped of a tip part of the insulating cover; the crimp terminal includes a wire barrel section for pressure-bonding and thus connecting the aluminum electric wire tip part (202a, 205a), and is formed of a metal material having a higher potential than that of a metal material used to form the aluminum electric wire (202, 205); the wire barrel section in a pre-pressure-bonding state includes wire barrel pieces extending in oblique outer upper directions from both sides of a barrel bottom section in a width direction; the aluminum electric wire tip part (202a, 205a) is covered with a cover member formed of the cover solder and a cover resin; the cover solder and the cover resin permeates into an area of an insulating cover inner with respect to an insulating cover tip part of the insulating cover, wherein the cover resin is a hot-melt-type resin; the cover resin covering the aluminum electric wire tip part contacts the insulating cover tip part of the insulating cover, thereby improving the durability against vibration; and the aluminum electric wire tip part (202a, 205a) is pressure-bonded and thus connected to the wire barrel section, such that the aluminum electric wire tip part (202a, 205a) is, in a pressure-bonded state, covered with the cover member, with no gap, from the tip part of the insulating cover to a rear end portion of the wire barrel section. an aluminum electric wire tip part (202a, 205a) and a crimp terminal which are connected to each other; wherein: the aluminum electric wire tip part (202a, 205a) is an exposed tip part of an insulated wire including an aluminum electric wire (202, 205) and an insulating cover for covering the aluminum electric wire (202, 205), and is exposed as a result of being stripped of a tip part of the insulating cover; the crimp terminal includes a wire barrel section for pressure-bonding and thus connecting the aluminum electric wire tip part (202a, 205a), and is formed of a metal material having a higher potential than that of a metal material used to form the aluminum electric wire (202, 205); the wire barrel section in a pre-pressure-bonding state includes wire barrel pieces extending in oblique outer upper directions from both sides of a barrel bottom section in a width direction; the aluminum electric wire tip part (202a, 205a) is covered with a cover member formed of the cover solder and a cover resin; the cover solder and the cover resin permeates into an area of an insulating cover inner with respect to an insulating cover tip part of the insulating cover, wherein the cover resin is a hot-melt-type resin; the cover resin covering the aluminum electric wire tip part contacts the insulating cover tip part of the insulating cover, thereby improving the durability against vibration; and the aluminum electric wire tip part (202a, 205a) is pressure-bonded and thus connected to the wire barrel section, such that the aluminum electric wire tip part (202a, 205a) is, in a pressure-bonded state, covered with the cover member, with no gap, from the tip part of the insulating cover to a rear end portion of the wire barrel section. the aluminum electric wire tip part (202a, 205a) is an exposed tip part of an insulated wire including an aluminum electric wire (202, 205) and an insulating cover for covering the aluminum electric wire (202, 205), and is exposed as a result of being stripped of a tip part of the insulating cover; the crimp terminal includes a wire barrel section for pressure-bonding and thus connecting the aluminum electric wire tip part (202a, 205a), and is formed of a metal material having a higher potential than that of a metal material used to form the aluminum electric wire (202, 205); the wire barrel section in a pre-pressure-bonding state includes wire barrel pieces extending in oblique outer upper directions from both sides of a barrel bottom section in a width direction; the aluminum electric wire tip part (202a, 205a) is covered with a cover member formed of the cover solder and a cover resin; the cover solder and the cover resin permeates into an area of an insulating cover inner with respect to an insulating cover tip part of the insulating cover, wherein the cover resin is a hot-melt-type resin; the cover resin covering the aluminum electric wire tip part contacts the insulating cover tip part of the insulating cover, thereby improving the durability against vibration; and the aluminum electric wire tip part (202a, 205a) is pressure-bonded and thus connected to the wire barrel section, such that the aluminum electric wire tip part (202a, 205a) is, in a pressure-bonded state, covered with the cover member, with no gap, from the tip part of the insulating cover to a rear end portion of the wire barrel section.