According to one embodiment, a pulse wave detector includes a casing connected to a band which together are configured to be worn on a wrist or a forearm of a subject, and at least one light detection unit comprising a light-emitting unit configured to radiate light toward the wrist or the forearm of a subject and a light-receiving unit configured to detect light of the radiated light which has been reflected from the subject, the light-emitting unit and the light-receiving unit spaced from each other in the casing.
