Electronic device including injection structure, and injection mold structure for injection structure

An electronic device comprising:

• a housing including a front plate oriented in a first direction, a rear plate oriented in a second direction opposite the first direction, and a side member surrounding an internal space between the front plate and the rear plate;
• a display visible through at least a portion of the front plate;
• and
• a mid-plate located between the front plate and the rear plate,
• wherein, the mid-plate includes a first portion disposed between the front plate and the side member when viewed from an outside of the housing, and the first portion includes:
• a first surface supporting a portion of the front plate and oriented in the first direction;
• a second surface exposed to the outside of the housing;
• a third surface oriented in a third direction different from the first direction and the second direction, and facing a side face of the front plate;
• and
• a protrusion protruding in the third direction on the third surface,
• wherein the first portion includes:
• a first region including a region exposed to the outside;
• and
• a second region extending from the first region and supporting the display,
• wherein the first region includes:
• a first section extending from an end of the second region;
• a second section extending from the first section in the first direction;
• and
• a third section extending from the second section in the first direction and including a curved shape on a face oriented in the first direction, and
• wherein the third surface includes:
• a (3-1)th face disposed in the first section and having a length of 40% to 60% of the third surface;
• a (3-2)th face disposed in the second section and extending from the (3-1)th face;
• and
• a (3-3)th face disposed in the third section and extending from the (3-2)th face so as to form a curved face, and
• the protrusion is disposed to protrude from a portion of the (3-2)th face toward an inside of the electronic device.