Portable electronic device, camera module, and lens assembly

A camera module comprising:

• a lens including an optical portion refracting light and a flange portion extended along a periphery of at least a portion of the optical portion;
• and
• a lens barrel accommodating the lens,
• wherein the flange portion includes a first D-cut portion, a second D-cut portion opposite to the first D-cut portion, a circular arc portion connecting the first D-cut portion and the second D-cut portion to each other, and a third D-cut portion in the circular arc portion,
• wherein the circular arc portion is in contact with the lens barrel, and the first D-cut portion, the second D-cut portion, and the third D-cut portion are spaced apart from the lens barrel, and
• wherein the first D-cut portion and the second D-cut portion include respective boundary lines that separate the remaining surfaces of the first D-cut portion and the second D-cut portion from an end of the first D-cut portion and an end of the second D-cut portion.