What is claimed is:1. An electronic device comprising:a display;an upper housing surrounding a periphery of the display and forming a front of the electronic device;a lower housing coupled to the upper housing and forming a rear of the electronic device; anda window waterproof member disposed in an aperture between the upper housing and the periphery of the display,wherein the window waterproof member includes:an outer sheath composed of a first material; andan inner core composed of a second material more rigid than the first material and disposed substantially in the outer sheath such that each of an upper surface and a lower surface of the inner core facing the front and the rear of the electronic device, respectively, does not protrude out of a periphery of the outer sheath, andwherein the outer sheath surrounds, at a first portion of the window waterproof member, a first side surface and a second side surface but not the lower surface of the inner core.2. The electronic device of claim 1, wherein the outer sheath is substantially in contact with the upper housing and the periphery of the display.3. The electronic device of claim 2, wherein the outer sheath surrounds, at a second portion of the window waterproof member, the first side surface, the second side surface and the lower surface of the inner core.4. The electronic device of claim 3, wherein the first portion and the second portion are formed repeatedly at the window waterproof member.5. The electronic device of claim 3, wherein the first portion and the second portion are formed at an entirety of the window waterproof member.6. The electronic device of claim 3, wherein the first portion and the second portion are formed partially at the window waterproof member.7. The electronic device of claim 3, wherein a first thickness of the inner core at the second portion is thicker than a second thickness of the inner core at the first portion.8. The electronic device of claim 1, wherein the inner core is formed of at least one of metal or plastic.9. The electronic device of claim 1, wherein the outer sheath is formed of at least one of silicon or rubber.10. An electronic device comprising:a display;an upper housing surrounding a periphery of the display and forming a front of the electronic device;a lower housing coupled to the upper housing and forming a rear of the electronic device;a speaker;a bracket, on which at least a portion of the speaker is seated and having at least a portion of a speaker sound hole, from which an audio signal generated by the speaker is output;a speaker hole formed on one side of the lower housing and aligned with the speaker sound hole; anda speaker waterproof member configured to seal an aperture between at least part of the lower housing having the speaker hole and at least part of the bracket having the speaker hole,wherein the speaker waterproof member includes:an outer sheath composed of a first material; andan inner core composed of a second material more rigid than the first material and disposed substantially in the outer sheath such that each of an upper surface and a lower surface of the inner core facing the front and the rear of the electronic device, respectively, does not protrude out of a periphery of the outer sheath.11. The electronic device of claim 10, wherein the speaker waterproof member includes:a speaker waterproof support aligned with the speaker hole of the lower housing and a center of which is opened; anda speaker waterproof boss protruding from a bottom surface of the speaker waterproof support in a band shape and contacting at least a portion of the bracket.12. The electronic device of claim 11, wherein the speaker waterproof member further includes:a bonding member fixing the speaker waterproof support to the lower housing.13. The electronic device of claim 10, further comprising:a waterproof film configured to interrupt at least a portion between the speaker hole and the speaker sound hole while outputting the audio signal.14. An electronic device comprising:a display;an upper housing disposed on at least a portion of a periphery of the display;a lower housing coupled to the upper housing;a microphone;a bracket including a microphone sound hole;a microphone hole formed on one side of the lower housing and aligned with the microphone sound hole; anda microphone waterproof member configured to seal an aperture between at least part of the lower housing having the microphone hole and at least part of the bracket having the microphone sound hole,wherein the microphone waterproof member includes:an outer sheath composed of a first material; andan inner core composed of a second material more rigid than the first material and disposed substantially in the outer sheath such that each of an upper surface and a lower surface of the inner core facing a front and a rear of the electronic device, respectively, does not protrude out of a periphery of the outer sheath.15. The electronic device of claim 14, wherein the microphone waterproof member further comprises:a microphone waterproof support aligned with the microphone hole of the lower housing and a center of which is opened; anda microphone waterproof boss protruding from the microphone waterproof support in a band shape and contacting the bracket.16. The electronic device of claim 15, further comprising:a bonding member fixing the microphone waterproof support to the lower housing.17. The electronic device of claim 15, further comprising:a stiffener film configured to support a strength of the microphone waterproof support.18. The electronic device of claim 15, further comprising:a membrane disposed in an opened area formed at a central portion of the microphone waterproof support to interrupt introduction of moisture from outside and discharge moisture in the interior of the electronic device to the outside.