Electronic device comprising waterproofing structure

An electronic device comprising:

• a display;
• a housing including a frame coupled with the display in a first direction, and a rear plate coupled with the frame in a second direction opposite to the first direction;
• and
• a circuit board disposed inside the housing and having a first surface facing the first direction and a second surface facing the second direction,
• wherein the frame includes a waterproofing member injection port configured to receive a waterproofing member including an injectable water resistant material in the first direction configured to provide a seal between the display and the frame,
• wherein the waterproofing member injection port includes an opening, a sidewall on an outer periphery of the opening, and a seating surface on at least a portion of a surface of the sidewall facing the second direction, and
• wherein the circuit board includes a substrate extension at least partially overlapping the seating surface of the waterproofing member injection port when viewed in the second direction.