A biometric information detecting apparatus includes: a band unit； a case unit that is attached to the band unit； a sensor unit that is provided in the case unit； and a processing unit that is provided in the case unit and detects biometric information based on a detection signal from the sensor unit. The band unit includes an inner surface having a first curved surface shape on a side thereof that faces a test object when the biometric information detecting apparatus is mounted, and the case unit includes an outer surface having a second curved surface shape that faces the inner surface of the band unit.
