Electronic device including key button

An electronic device comprising:

• a front cover;
• a rear cover facing away from the front cover;
• a side frame connecting the front cover and the rear cover, the side frame comprising an outer surface configured to at least partially form an external appearance of the electronic device, a button accommodation recess having a predetermined depth from the outer surface in a first direction oriented to an inner space of the electronic device, and at least one through-hole connected to an inner surface of the side frame in the button accommodation recess;
• a key button disposed through the button accommodation recess, the key button comprising a key top inserted into the button accommodation recess and at least partially exposed to an outside, and a key base coupled to the key top and comprising a protrusion facing a key flexible printed circuit board (FPCB) disposed in the inner space through the at least one through-hole;
• and
• a waterproof member disposed between the key FPCB and the inner surface of the side frame to be in close contact therewith,
• wherein the protrusion comprises an engagement portion having a first inclined surface,
• wherein the at least one through-hole comprises a second inclined surface,
• wherein, when the protrusion passes through the at least one through-hole, the first inclined surface of the engagement portion is engaged with the second inclined surface,
• wherein the waterproof member is configured to seal a periphery of the at least one through-hole, and
• wherein the key FPCB is configured to perform a switching operation through which the protrusion and the engagement portion press the waterproof member.

An electronic device comprising:

• a front cover;
• a rear cover facing away from the front cover;
• a side frame connecting the front cover and the rear cover, the side frame comprising an outer surface configured to at least partially form an external appearance of the electronic device, a button accommodation recess having a predetermined depth from the outer surface in a first direction oriented to an inner space of the electronic device, and at least one through-hole connected to an inner surface of the side frame in the button accommodation recess;
• a key button disposed through the button accommodation recess, the key button comprising a key top inserted into the button accommodation recess and at least partially exposed to an outside, and a key base coupled to the key top and comprising a protrusion facing a key flexible printed circuit board (FPCB) disposed in the inner space through the at least one through-hole, wherein the protrusion comprises an engagement portion formed at an end thereof to be larger than the protrusion, and after the protrusion passes through the at least one through-hole, the engagement portion is engaged with the inner surface around the at least one through-hole;
• and
• a waterproof member disposed between the key FPCB and the inner surface of the side frame to be in close contact therewith, the waterproof member being configured to seal a periphery of the at least one through-hole comprising the engagement portion and a periphery of a dome key.