Optical module and electronic device including same

An electronic device comprising:

• a housing;
• an optical module in the housing, the optical module being configured to emit light of a predetermined wavelength band and receive first light reflected by a subject;
• at least one processor;
• and
• memory configured to store instructions that, when executed by the at least one processor, cause the electronic device to determine distance information to the subject based on at least the first light,
• wherein the optical module comprises:
• a first substrate;
• a light-emitting element assembly on the first substrate and configured to emit the light of the predetermined wavelength band;
• a light-receiving element on the first substrate and adjacent to one side of the light-emitting element assembly, the light-receiving element comprising a first detection area configured to receive the first light;
• and
• a first casing on the first substrate, the first casing comprising:
• a first accommodation space accommodating the light-emitting element assembly;
• a second accommodation space accommodating the first detection area;
• and
• a guide structure between the first accommodation space and the second accommodation space,
• wherein the light-receiving element further comprises a second detection area adjacent to one side of the first detection area and at least partially inside the guide structure, and
• wherein the second detection area is configured to receive second light that is a portion of the light emitted by the light-emitting element assembly and guided by the guide structure.