According to the present disclosure an electronic device is disclosed comprising: a housing including a front surface, a rear surface facing the direction opposite to the front surface, and a side surface encompassing the space between the front surface and the rear surface; a display included in the housing and visible to the outside of the electronic device through the front surface; an optical sensor positioned between the display and the rear surface overlapping at least one region of the display when viewed from above the front surface, and including a light-emitting part and a light-receiving part; and a first partition positioned between the light-emitting part and the light-receiving part based on the electronic device having a first shape, and a second partition present between the light-emitting part and the light-receiving part based on the electronic device having a second shape transformed from the first shape, wherein a straight line connecting the light-emitting part and the light-receiving part is perpendicular to the direction in which the electronic device changes from the first shape to the second shape.