A waterproof connector comprising: a first shell formed of a conductive material and disposed on a plug insertion side; a second shell formed of a conductive material and engaged with the first shell; an outer sealing member provided on an outer circumference of the first shell and positioned on an outer side of the first shell; a supporting portion accommodated in a wall form in a rear portion of an engagement assembly of the first shell and the second shell in a state in which water does not enter toward a rear side from a space between the engagement assembly and the supporting portion; wherein contact terminals are supported by the supporting portion, and the waterproof connector further comprises an inner sealing member having a circumferential form, provided between the engagement assembly and the supporting portion at a position at which the engagement assembly and the supporting portion approach each other so as to prevent water from passing between the engagement assembly and the supporting portion; wherein the first shell has an approximately tubular form; and characterised in that the second shell has an approximately tubular form; and at least one of the first shell having the approximately tubular form and the second shell having the approximately tubular form is seamless. a first shell formed of a conductive material and disposed on a plug insertion side; a second shell formed of a conductive material and engaged with the first shell; an outer sealing member provided on an outer circumference of the first shell and positioned on an outer side of the first shell; a supporting portion accommodated in a wall form in a rear portion of an engagement assembly of the first shell and the second shell in a state in which water does not enter toward a rear side from a space between the engagement assembly and the supporting portion; wherein contact terminals are supported by the supporting portion, and the waterproof connector further comprises an inner sealing member having a circumferential form, provided between the engagement assembly and the supporting portion at a position at which the engagement assembly and the supporting portion approach each other so as to prevent water from passing between the engagement assembly and the supporting portion; wherein the first shell has an approximately tubular form; and characterised in that the second shell has an approximately tubular form; and at least one of the first shell having the approximately tubular form and the second shell having the approximately tubular form is seamless. wherein contact terminals are supported by the supporting portion, and the waterproof connector further comprises an inner sealing member having a circumferential form, provided between the engagement assembly and the supporting portion at a position at which the engagement assembly and the supporting portion approach each other so as to prevent water from passing between the engagement assembly and the supporting portion; wherein the first shell has an approximately tubular form; and characterised in that the second shell has an approximately tubular form; and at least one of the first shell having the approximately tubular form and the second shell having the approximately tubular form is seamless.